"I heard Anas (narrate) that the Messenger of Allah (ﷺ) said: 'Be moderate in prostration and do not rest your forearms along the ground like a dog.'"
Sunan an-Nasa'i Book 12, Hadith 82
← Previous Hadith When the Prophet (ﷺ) prostrated he would hold his arms out from his sides so that if a lamb wanted to pass beneath his arms it would be able to do so.

Sunan an-Nasa'i Book 12, Hadith 81 Next Hadith → "The Messenger of Allah (ﷺ) said: 'No prayer is valid in which a man does not maintain his back (at ease) when bowing and prostrating.'"

Sunan an-Nasa'i Book 12, Hadith 83