[Machine] The Messenger of Allah ﷺ said, "When one of you bows down in prayer, he should say, 'Subhan Rabbiyal Adheem' (Glory be to my Lord, the Most Great) three times, for his bowing is complete and that is the least. And when he prostrates, he should say, 'Subhan Rabbiyal A'la' (Glory be to my Lord, the Most High) three times, for his prostration is complete and that is the least." This is narrated by 'Awn ibn Abdullah, who did not reach Abdullah ibn Mas'ud.
قَالَ رَسُولُ اللهِ ﷺ إِذَا رَكَعَ أَحَدُكُمْ فَقَالَ سُبْحَانَ رَبِّيَ الْعَظِيمِ ثَلَاثَ مَرَّاتٍ فَقَدْ تَمَّ رُكُوعُهُ وَذَلِكَ أَدْنَاهُ وَإِذَا سَجَدَ فَقَالَ سُبْحَانَ رَبِّيَ الْأَعْلَى يَعْنِي ثَلَاثًا فَقَدْ تَمَّ سُجُودُهُ وَذَلِكَ أَدْنَاهُ هَذَا مُرْسَلٌ عَوْنُ بْنُ عَبْدِ اللهِ لَمْ يُدْرِكْ عَبْدَ اللهِ بْنَ مَسْعُودٍ