Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Whoever is grieved by his evil deed is a believer."
Al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, Musa bin Ubaydah, who is utterly ruined in weakness.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 288
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