(123) باب الدُّعَاءِ فِي الرُّكُوعِ
Narrated `Aisha:
The Prophet (ﷺ) used to say in his bowing and prostrations, "Subhanaka l-lahumma Rabbana wa bihamdika; Allahumma ghfir li.' (Exalted [from unbecoming attributes] Are you O Allah our Lord, and by Your praise [do I exalt you]. O Allah! Forgive me).
Reference: Sahih al-Bukhari 794
In-book reference: Book 10, Hadith 189
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 12, Hadith 760