"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."
Reference: Jami` at-Tirmidhi 2403 In-book : Book 36, Hadith 101 English translation : Vol. 4, Book 10, Hadith 2403
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