Sayyiduna Ubadah bin Samit (may Allah be pleased with him) said: We were in a gathering with the Messenger of Allah (peace and blessings be upon him) when he said to us:“Pledge allegiance to me on the condition that you will not associate anything with Allah, nor steal, nor commit adultery, nor kill your children, nor slander anyone deliberately. Whoever among you fulfills this covenant, his reward is with Allah. And whoever among you falls into any of these matters (i.e., commits adultery, theft, etc.) and Allah conceals his (sin), then his matter is with Allah: if He wills, He will punish him, and if He wills, He will forgive him. And whoever commits any of these evil deeds and is punished for it in this world, then that punishment is an expiation for his sin.”So we pledged allegiance to him on these matters.