إِنَّ الَّذِينَ يُبَايِعُونَكَ إِنَّمَا يُبَايِعُونَ اللَّهَ يَدُ اللَّهِ فَوْقَ أَيْدِيهِمْ فَمَن نَّكَثَ فَإِنَّمَا يَنكُثُ عَلَى نَفْسِهِ وَمَنْ أَوْفَى بِمَا عَاهَدَ عَلَيْهُ اللَّهَ فَسَيُؤْتِيهِ أَجْرًا عَظِيمًا
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سورة الفتح
(48/10) Verily those who swear fealty Unto thee, only swear fealty Unto Allah: the hand of Allah is over their hands. So whosoever breaketh his oath, breaketh it only to his soul´s hurt; and whosoever fulfilleth that which he hath convenanted with Allah, him anon He shall give a mighty hire.
Surah Al-Fath