The Rights towards Allah, the Almighty

The essential right of man towards Allah is to worship Him alone, setting up no rivals or partners with Him, nor attributing any sons or daughters to Him . The eternal truth of all existence is that LA ILAHA ILAL-ALLAH "There is no god worthy of being worshipped except Allah, meaning that there is no so-called "god or deity or entity worthy of worship and absolute obedience. This is the testimony of faith of a Muslim that involves the following requirements:

Allah alone deserves to be worshiped and obeyed in an absolute sense. None has the right to be worshiped along with or besides Him. All statements, acts and hidden intentions must agree with what the Almighty has designated. All actions of man must be performed for the Pleasure of the Almighty. The Almighty Allah states in the Glorious Qur'an:

And your Lord said: "Invoke Me, [i.e. believe in My Oneness] (and ask Me for anything) I will respond to your (invocation). Verily! Those who scorn My worship [i.e. do not invoke Me, and do not believe in My Oneness] they will surely enter Hell in humiliation!

(40:60)

A Muslim is required to believe in the "Names and Attributes that Allah has given Himself, or those attributed to Him through revelation by His Prophet and Messenger . No one may attribute any name or quality by speculation to Allah that neither Allah nor His Prophet and Messenger have attributed to Him. He must not offer any undue explanation or similitude or to express an opinion concerning these Names and Attributes of Allah . Allah the Exalted says in the Glorious Qur'an:

(There is nothing like unto Him, and He is the All-Hearer, the All-Seer.) (42:11)

Man must submit himself to Allah in faith with total and sincere belief, declaring with his tongue, accepting with his heart and showing with his actions the truth of the statement that Allah, the Almighty states in the Glorious Qur'an:

So know that La ilaha ill-Allah (none has the right to be worshiped but Allah), and ask forgiveness for your sin, and also for (the sins of) believing men and believing women. And Allah knows well your moving about, and your place of rest (in your homes).
(47:19)

Human beings are obligated to give full and total submission to the Will of Allah .This is based on the instruction of the verse of the Glorious Qur'an:

It is not for a believer, man or woman, when Allah and His Messenger have decreed a matter that they should have any option in their decision. And whoever disobeys Allah and His Messenger, he has indeed strayed in a plain error.
(33:36)

A Muslim must have pure love of Allah as well as His Prophet and Messenger . This love should dominate the love of other beings and his own self in times of conflict and contradiction. Allah the Exalted says in the verse of the Glorious Qur'an:

Say: If your fathers, your sons, your brothers, your wives, your kindred, the wealth that you have gained, the commerce in which you fear a decline, and the dwellings in which you delight...are dearer to you than Allah and His Messenger, and striving hard and fighting in His Cause, then wait until Allah brings about His Decision (torment). And Allah guides not the people who are Al-Fasiqun (the rebellious, disobedient to Allah).
(9:24)

Man must worship Allah only in the manner and form legislated by Allah through his Messenger and Prophet . It is not allowed to invent an act of worship through speculation and then ascribe it to the true religion. All the worship should be in line with the revealed religion of Islam. For example to offer the "Salah prayer. One of the fruits of offering and maintaining such prayer is that it helps to enjoin good and stop all evil acts. Allah, the Almighty states in the Glorious Qur'an:

Recite what has been revealed to you of the Book (the Qur'an), and perform As-Salah. Verily, As-Salah (the prayer) prevents fromAl-Fahsha' (i.e. great sins of every kind, unlawful sexual intercourse, etc.) and Al-Munkar (i.e. disbelief, polytheism, and every kind of evil wicked deed, etc.) and the remembering of Allah is the greatest indeed. And Allah knows what you do.
(29:45)

The payment of Zakah (obligatory charity) to the destitute and needy generates self-purification and elimination of miserliness and niggardliness, as well as alleviating the pains and trials of the less fortunate. Allah, the Almighty states in the Glorious Qur'an:

He who spends his wealth for increase in self-purification. And who has (in mind) no favor from anyone to be paid back. Except to seek the Countenance of his Lord, the Most High. He surely will be pleased (when he will enter Paradise). ) (92:18-21)

Observing Saum (fasting) enables man to have better control and self-discipline over temptations and passions. Man becomes more conscious of the sense of piety and God-fearing, and the needs of the poor and less fortunate. The Almighty Allah states in the Glorious Qur'an:

O you who believe! Observing as-Saum (the fasting) is prescribed for you as it was prescribed for those before you, that you may become Al-Muttaqun (the pious).
(2:183)

Hajj (pilgrimage) has many benefits, as Allah, the Almighty states in the Glorious Qur'an:

That they may witness things that are of benefit to them (i.e. reward of Hajj in the Hereafter, and also some worldly gain from trade, etc.), and mention the Name of Allah on appointed days, over the beast of cattle that He has provided for them. Then eat thereof and feed therewith the poor who have a very hard time.
(22:28)

All these and other acts of worship in Islam are meant for man's own benefit. There is never undue hardship when performed under normal circumstances. Allah, the Almighty states in the Glorious Qur'an:

Allah intends for you ease and He does not want to make things difficult for you.
(2:185)

The Messenger of Allah said in support of this concept:

If I command you to do anything, do as much as you can.
Bukhari, Hadith No. 1337.

And he said:

Religion is easy
Bukhari, Hadith No. 39.

In the event of sickness and other legitimate hardships, worships are either completely exempted or sustained with some concessions. For instance, standing is required to perform daily-prescribed prayer but if one is unable he may offer it sitting down, and if that is not possible, by lying down on the side of the body or on his back, or in any other way that is suitable and comfortable to his situation. If a worshipper is not able to maintain his prayer in any of the above situations, he may pray by the motions of his hands or even eyes. It is incumbent to perform ablution prior to offering a prayer but this requirement is waived if a Muslim cannot find water or there is some harm in its use. In place of water, he performs Tayammum (Dry ablution) instead and offers his prayer exactly as if he had performed ablution with water. A woman in her menstrual period or one who is experiencing post-natal bleeding is exempted from performing prayer until her bleeding completely stops, and she is not required to make up the prayers she missed. A Muslim, male or female, who does not possess Nisab (the requisite minimal amount on the basis of which it is obligatory to pay Zakah), is not required to pay any Zakah. An old person who is unable to observe fasting, and a sick person who also cannot observe fasting are conveniently exempted from fasting. They have to pay its atonement if they are able. Atonement is to feed a needy person one meal for each day not fasted. Similarly, a traveler may break his fast while traveling, as traveling involves hardship and fatigue. A woman in her menses or after childbirth is not to fast until her bleeding completely stops, whereupon she makes up those missed days of fasting. The Hajj is not obligatory on any person who is incapable due to physical inability or financial constraints since the person intending Hajj must have sufficient funds to satisfy himself and his family's needs beyond the expenses of pilgrimage. Allah, the Exalted, says in the Glorious Qur'an:

In it are manifest signs (for example), the Station of Ibrahim (Abraham); whosoever enters it, he attains security. And Hajj (pilgrimage to Makkah) to the House (Ka'bah) is a duty that mankind owes to Allah, those who can afford the expenses; and whoever disbelieves [i.e. denies Hajj then he is a disbeliever of Allah], then Allah stands not in need of any of His creatures.
(3:97)

Another example of the mitigation of hardships in Islam is when a person faces the shortage of lawful food and is on the brink of death; in this case, he is allowed to take even unlawful food items like blood and meat of dead animals, enough to keep him alive. This rule is also based upon the instructions of the verse of the Glorious Qur'an:

He has forbidden you only the dead animals, and blood, and the flesh of swine, and that which is slaughtered as a sacrifice for others than Allah. But if one is forced by necessity without willful disobedience nor transgressing due limits, then there is no sin on him. Truly, Allah is Oft-Forgiving, Most Merciful.