Abu Hurairah narrated that the Prophet(s.a.w) said:"There is no one who dies but he shall regret." They said: "What shall he regret over O Messenger of Allah?" He said: "If he was a good doer, he regrets that he did not do more, and if he was an evil doer, he regrets that he did not stop

English translation · Jami' at-Tirmidhi