‘Ubada b. as-Samit reported that God's messenger said when a number of his Companions were around him, “Swear allegiance to me on the basis that you will not associate anything with God, or steal, or commit fornication, or kill your children, or produce slander which you yourselves have falsely fabricated, or be disobedient concerning what is good. If any of you fulfils his promise, God will undertake his reward but if anyone perpetrates any of these things and is punished for it in this world, it will be an atonement for him. If, however, anyone perpetrates any of those things and God conceals it regarding him, the matter lies in God’s hands; if He wishes He will forgive him, and if He wishes He will punish him.” So we swore allegiance to him on that basis. (Bukhari and Muslim.)