Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: When any one of you perfects his Islam (i.e., purifies it from hypocrisy and show-off), then for every good deed he does, ten to seven hundred times rewards are written for him, and for every bad deed he does, only that much (i.e., equal to what he did) is written.