48:10
إِنَّٱلَّذِينَيُبَايِعُونَكَإِنَّمَايُبَايِعُونَٱللَّهَيَدُٱللَّهِفَوْقَأَيْدِيهِمْ ۚفَمَننَّكَثَفَإِنَّمَايَنكُثُعَلَىٰنَفْسِهِۦ ۖوَمَنْأَوْفَىٰبِمَاعَٰهَدَعَلَيْهُٱللَّهَفَسَيُؤْتِيهِأَجْرًاعَظِيمًا١٠
inna alladhīna yubāyiʿūnaka innamā yubāyiʿūna l-laha yadu l-lahi fawqa aydīhim faman nakatha fa-innamā yankuthu ʿalā nafsihi waman awfā bimā ʿāhada ʿalayhu l-laha fasayu'tīhi ajran ʿaẓīman
Indeed, those who pledge allegiance to you, [O Muḥammad] - they are actually pledging allegiance to Allāh. The hand of Allāh 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 Allāh - He will give him a great reward.(10)