إِنَّ الَّذينَ يُبايِعونَكَ إِنَّما يُبايِعونَ اللَّهَ يَدُ اللَّهِ فَوقَ أَيديهِم ۚ فَمَن نَكَثَ فَإِنَّما يَنكُثُ عَلىٰ نَفسِهِ ۖ وَمَن أَوفىٰ بِما عاهَدَ عَلَيهُ اللَّهَ فَسَيُؤتيهِ أَجرًا عَظيمًا

Those who pledge allegiance to you are, in essence, pledging allegiance to God. The hand of God is above their hands. Whoever breaks his pledge, breaks it to his own harm. And whoever fulfills his covenant with God, He will grant him a magnificent reward.