Sunan an-Nasa'i 735
سنن النسائي#735Sahihأَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ أَشْعَثَ، عَنِ الْحَسَنِ، عَنْ عَبْدِ اللَّهِ بْنِ مُغَفَّلٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ الصَّلاَةِ فِي أَعْطَانِ الإِبِلِ .
It was narrated from 'Abdullah bin Mughaffal that the Messenger of Allah (ﷺ) forbade praying in the camel pens. [1] A'tan:Kneeling places, or, where they kneel to drink water
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:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 8:48