Sunan Abi Dawud 841
سنن أبي داود#841Sahihحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ نَافِعٍ، عَنْ مُحَمَّدِ بْنِ عَبْدِ اللَّهِ بْنِ حَسَنٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " يَعْمِدُ أَحَدُكُمْ فِي صَلاَتِهِ فَيَبْرُكُ كَمَا يَبْرُكُ الْجَمَلُ " .
Narrated AbuHurayrah: The Prophet (ﷺ) said: (Does) one of you kneel down in his prayer as a camel kneels down (i.e. put his knees before his hands)
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:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautHasan
Zubair Ali ZaiHasan
In-book reference: 2:451