Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) used to recite this in prostration: "O Allah! Forgive all my sins, those that are hidden and those that are apparent, those committed earlier and those committed later, those done openly and those done secretly."
Hadith Referenceصحیح ابن حبان / كتاب الصلاة / 1931
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «صحيح أبي داود» (822): م.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط مسلم.