Sunan an-Nasa'i 887
سنن النسائي#887Sahihأَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ مُوسَى بْنِ عُمَيْرٍ الْعَنْبَرِيِّ، وَقَيْسِ بْنِ سُلَيْمٍ الْعَنْبَرِيِّ، قَالاَ حَدَّثَنَا عَلْقَمَةُ بْنُ وَائِلٍ، عَنْ أَبِيهِ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم إِذَا كَانَ قَائِمًا فِي الصَّلاَةِ قَبَضَ بِيَمِينِهِ عَلَى شِمَالِهِ .
It was narrated that Musa bin Umair Al-Anbari and Qais bin Sulaim Al-Anbari said:"Alqamah bin Wa'il told us that his father said: "I saw the Messenger of Allah (ﷺ), when he was standing in prayer, holding his left hand with his right
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: 11:12