Sahih al-Bukhari 817
Sahih al-Bukhari · Book 10: Call to Prayers (Adhaan) · To invoke and glorify Allah in prostration
Narrated `Aisha:
حَدَّثَنَا مُسَدَّدٌ ، قَالَ حَدَّثَنَا يَحْيَى ، عَنْ سُفْيَانَ ، قَالَ حَدَّثَنِي مَنْصُورٌ ، عَنْ مُسْلِمٍ ، عَنْ مَسْرُوقٍ ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ أَنَّهَا قَالَتْ كَانَ النَّبِيُّ صلى الله عليه وسلم يُكْثِرُ أَنْ يَقُولَ فِي رُكُوعِهِ وَسُجُودِهِ " سُبْحَانَكَ اللَّهُمَّ رَبَّنَا وَبِحَمْدِكَ، اللَّهُمَّ اغْفِرْ لِي " يَتَأَوَّلُ الْقُرْآنَ.
The Prophet (ﷺ) used to say frequently 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). In this way [??] he was acting on what was explained to him in the Holy Qur'an.