Abu Malik narrates from his father that the Prophet (peace and blessings be upon him) said: "Any servant who goes into prostration and says: 'Rabbighfir li (O my Lord, forgive me)', if he says it three times, Allah Almighty forgives him before he raises his head."
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir as a narration of Muhammad bin Jabir from this Abu Malik, and I have not seen anyone who gave the biographies of these two.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2785
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«أخرجه المعجم الكبير للطبراني برقم: 8197»