Al-Fat-H 48:10 ان الذين يبايعونك انما يبايعون الله يد الله فوق ايديهم فمن نكث فانما ينكث على نفسه ومن اوفى بما عاهد عليه الله فسيوتيه اجرا عظيما ١٠

Lo! those who swear allegiance unto thee (Muhammad), swear allegiance only unto Allah. The Hand of Allah is above their hands. So whosoever breaketh his oath, breaketh it only to his soul's hurt; while whosoever keepeth his covenant with Allah, on him will He bestow immense reward.

Verily those who plight their fealty to thee do no less than plight their fealty to Allah: the Hand of Allah is over their hands: then any one who violates his oath, does so to the harm of his own soul, and any one who fulfils what he has covenanted with Allah,- Allah will soon grant him a great Reward.