Sunan At-Tirmidhi

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