الفتح — Al-Fath Ayat 10
اِنَّ الَّذِيْنَ يُبَايِعُوْنَكَ اِنَّمَا يُبَايِعُوْنَ اللّٰهَ ۗيَدُ اللّٰهِ فَوْقَ اَيْدِيْهِمْ ۚ فَمَنْ نَّكَثَ فَاِنَّمَا يَنْكُثُ عَلٰى نَفْسِهٖۚ وَمَنْ اَوْفٰى بِمَا عٰهَدَ عَلَيْهُ اللّٰهَ فَسَيُؤْتِيْهِ اَجْرًا عَظِيْمًا ࣖ
Innal-lażīna yubāyi‘ūnaka innamā yubāyi‘ūnallāh(a), yadullāhi fauqa aidīhim, faman nakaṡa fa'innamā yankuṡu ‘alā nafsih(ī), wa man aufā bimā ‘āhada ‘alaihullāha fa sayu'tīhi ajran ‘aẓīmā(n).
"Indeed, those who pledge allegiance to you, [O Muhammad] - they are actually pledging allegiance to Allah. The hand of Allah is over their hands. So he who breaks his word only breaks it to the detriment of himself. And he who fulfills that which he has promised Allah - He will give him a great reward."