Sunan Abi Dawud 868
سنن أبي داود#868Sahihحَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، حَدَّثَنَا الأَعْمَشُ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، وَالأَسْوَدِ، عَنْ عَبْدِ اللَّهِ، قَالَ إِذَا رَكَعَ أَحَدُكُمْ فَلْيَفْرِشْ ذِرَاعَيْهِ عَلَى فَخِذِهِ وَلْيُطَبِّقْ بَيْنَ كَفَّيْهِ فَكَأَنِّي أَنْظُرُ إِلَى اخْتِلاَفِ أَصَابِعِ رَسُولِ اللَّهِ صلى الله عليه وسلم .
‘Abd Allah (b. Masud) said:When any of you bows, he should spread his arms on his thighs and clap both his palms (Placing them between the knees), as if I am seeing the variation of the fingers of the Messenger of Allah(ﷺ)
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: 2:478