Sayyiduna Abu Hurayrah (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) said: "Remorse is repentance."
Al-Tabarani recorded it in al-Mu'jam al-Saghir, and its narrators have been declared trustworthy, though there is disagreement about them.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التوبة / 17520
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه الطبراني فى المعجم الصغير (186) ، أخرجه شرح السنة برقم: 1307»