This is part 4 of 4 of “The Book of the Commencement of the Prayer”, book 11 of Sunan an-Nasa'i — Hadith 1,026–1,028. The book is long enough that it is split across 4 pages so each one stays quick to load; the parts run in order and are linked at the foot of the page.
It was narrated from 'Alqamah, that Abdullah said:"Shall I not tell you about the prayer of the Messenger of Allah (ﷺ)? He stood and raised his hands the first time and then he did not do that again
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا الْفُضَيْلُ، عَنِ الأَعْمَشِ، عَنْ عُمَارَةَ بْنِ عُمَيْرٍ، عَنْ أَبِي مَعْمَرٍ، عَنْ أَبِي مَسْعُودٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ تُجْزِئُ صَلاَةٌ لاَ يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ " .
It was narrated that Abu Mas'ud said:"The Messenger of Allah (ﷺ) said: 'The prayer is not valid if a man does not bring his backbone to rest while bowing and prostrating
It was narrated from Anas that the Messenger of Allah (ﷺ) said:"Be moderate in bowing and prostration, and do not rest your forearms along the ground like a dog
Sahih· Abu Ghuddah
Sahih· Al-Albani
Sahih· Zubair Ali Zai
Text from the open hadith-api dataset. Hadith numbering follows that edition and can differ slightly from a printed copy — check the Arabic against a trusted mushaf of hadith before relying on a reference.