Sunan Abi Dawud 755
سنن أبي داود#755Hasanحَدَّثَنَا مُحَمَّدُ بْنُ بَكَّارِ بْنِ الرَّيَّانِ، عَنْ هُشَيْمِ بْنِ بَشِيرٍ، عَنِ الْحَجَّاجِ بْنِ أَبِي زَيْنَبَ، عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ، عَنِ ابْنِ مَسْعُودٍ، أَنَّهُ كَانَ يُصَلِّي فَوَضَعَ يَدَهُ الْيُسْرَى عَلَى الْيُمْنَى فَرَآهُ النَّبِيُّ صلى الله عليه وسلم فَوَضَعَ يَدَهُ الْيُمْنَى عَلَى الْيُسْرَى .
Narrated Abdullah ibn Mas'ud: AbuUthman an-Nahdi said: When Ibn Mas'ud prayed he placed his left hand on the right. The Prophet (ﷺ) saw him and placed his right hand on his left one
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: 2:365