Bond is mentioned in the Quran in these verses:
[2:256] There shall be no compulsion in religion: the right way is now distinct from the wrong way. Anyone who denounces the devil and believes in God has grasped the strongest bond; one that never breaks. God is Hearer, Omniscient.
[2:283] If you are traveling, and no scribe is available, a bond shall be posted to guarantee repayment. If one is trusted in this manner, he shall return the bond when due, and he shall observe God his Lord. Do not withhold any testimony by concealing what you had witnessed. Anyone who withholds a testimony is sinful at heart. God is fully aware of everything you do.
[31:22] Those who submit completely to God, while leading a righteous life, have gotten hold of the strongest bond. For God is in full control of all things.
To learn more, read the Quran in English.
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