A. It is necessary to fulfil obligations: (5:1)
"O you who believe! Fulfil obligations."
The word includes personal contracts as well as treaties. (17:34)
"Fulfil (every) obligation, for every obligation will be enquired into". It means the breaking of an obligation is accountable.
B. The fulfillment of obligations is the sign characteristic of believers: (23:8)
"Those who faithfully observe their trusts and their covenants." Also (70:32); (3:75); (3:177), (70:32)
C. The Quran presents a comprehensive guidance when says: (61:2-3)
"O you who believe! Why do you say which you do not. Grievously odious it is in the sight of Allah Almighty that you say that which you do not do. A man's act must coincide with he says."
D. To fulfil your covenant with Allah Almighty is also a necessity. (16:91); (6:152)
"And fulfil the covenant of Allah."
Covenant with Allah Almighty also includes those responsibilities which man takes upon himself with his belief in Allah.
In those who break their obligations with the Islamic state, it is said: (13:25)
"Those who break the covenant with Allah Almighty after ratifying it and cut asunder the human relationship which Allah Almighty has commanded should be joined, and make mischief on earth; for them is the curse; theirs is the terrible abode."
At yet another place it is called "selling of obligations": (16:95) also (3:76), (2:41)
"Nor sell the covenant of Allah Almighty for a miserable price for the sake of worldly gains". In our opinion it also includes the conspiracies against an Islamic state, which the intriguers bring about in league with the enemy."
The biggest and the basic covenant between man and Allah Almighty which makes the man a 'believer' is, that the sells his life and property to Allah: (9:111)
"It is a reality that Allah Almighty purchases of the believers their persons and their wealth, and gives them a heavenly life is return". Note that it is not a matter of belief alone; it is meant to be brought into practice. Its practical shape is that it is a contract between an Islamic state and the believers, in the name of Allah. (This is not the place for its explanation. For contacts with other states, see under the leading " STATE AFFAIRS").