Sunan Abi Dawud 885
سنن أبي داود#885Sahihحَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا خَالِدُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سَعِيدٌ الْجُرَيْرِيُّ، عَنِ السَّعْدِيِّ، عَنْ أَبِيهِ، أَوْ عَنْ عَمِّهِ، قَالَ رَمَقْتُ النَّبِيَّ صلى الله عليه وسلم فِي صَلاَتِهِ فَكَانَ يَتَمَكَّنُ فِي رُكُوعِهِ وَسُجُودِهِ قَدْرَ مَا يَقُولُ " سُبْحَانَ اللَّهِ وَبِحَمْدِهِ " . ثَلاَثًا .
Sa’d reported that he heard his father or his uncle say ; I witnessed the Prophet (ﷺ) while offering prayer. He used to stay in his bowing and his prostration as long as one uttera the words “Glory be to Allah and praise be to Him” three times
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 2:495