Sayyiduna Wa'il bin Hujr (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) said: "Remorse is repentance."
Al-Tabarani recorded it; its chain contains Isma'il bin Amr al-Bajali, whom Ibn Hibban declared thiqah (trustworthy) while more than one scholar declared him da'if (weak), and the rest of its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التوبة / 17518
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (41/22) ، أخرجه شرح السنة برقم: 1307»