Sunan Ibn Majah, Volume 2, Book 5, Hadith 889 (DarusSalam) ⓘ
It was narrated that ‘Aishah said: “The Messenger of Allah often used to say when bowing and prostrating: ‘Subhanak Allahumma wa bi hamdika, Allahummaghfir li (Glory be to You, O Allah, and praise; O Allah forgive me),’ following the command given by the Qur’an.”[Surat An-Nasr (110)]
حَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ أَبِي الضُّحَى، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يُكْثِرُ أَنْ يَقُولَ فِي رُكُوعِهِ وَسُجُودِهِ " سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي " . يَتَأَوَّلُ الْقُرْآنَ .
also referenced under: Hadith 889 (Reference) & Book 5, Hadith 939 (In-Book)