Riyad as-Salihin 15:18

'Aishah (May Allah be pleased with her) reported:

The Prophet (ﷺ) used to recite frequently in his bowing and prostration: "Subhanak- Allahumma, Rabbana wa bihamdika. Allahum-maghfir li (O Allah! You are free from imperfection and I begin with praising You. Forgive my sins)." [Al-Bukhari and Muslim] .