Sunan Abu Dawud 900
Prayer (Kitab Al-Salat)
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا عَبَّادُ بْنُ رَاشِدٍ، حَدَّثَنَا الْحَسَنُ، حَدَّثَنَا أَحْمَرُ بْنُ جَزْءٍ، صَاحِبُ رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ إِذَا سَجَدَ جَافَى عَضُدَيْهِ عَنْ جَنْبَيْهِ حَتَّى نَأْوِيَ لَهُ .
Narrated Ahmar ibn Jaz': When the Messenger of Allah (ﷺ) prostrated himself, he kept his arms far away from his sides so much so that we took pity on him
Grading: Al-Albani: Hasan Sahih · Muhammad Muhyi Al-Din Abdul Hamid: Hasan Sahih · Shuaib Al Arnaut: Sahih Lighairihi · Zubair Ali Zai: Isnaad Hasan
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.