Sunan Abi Dawud 959
سنن أبي داود#959Sahihحَدَّثَنَا ابْنُ مُعَاذٍ، حَدَّثَنَا عَبْدُ الْوَهَّابِ، قَالَ سَمِعْتُ يَحْيَى، قَالَ سَمِعْتُ الْقَاسِمَ، يَقُولُ أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ، أَنَّهُ سَمِعَ عَبْدَ اللَّهِ بْنَ عُمَرَ، يَقُولُ مِنْ سُنَّةِ الصَّلاَةِ أَنْ تُضْجِعَ رِجْلَكَ الْيُسْرَى وَتَنْصِبَ الْيُمْنَى .
(There is another chain) reported from Yahya who said:"I heard Al-Qasim saying: "Abdullah bin 'Abdullah informed me that he heard 'Abdullah bin 'Umar saying: "From the Sunnah of the prayer is to lay your left foot on the ground, and raise your right foot
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: 2:570