"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
← Previous Hadith "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 Next Hadith → The Messenger of Allah (ﷺ) forbade three things: "Pecking like a crow, resting one's forearms on the ground like a predator, and allocating the same place for prayer like a camel gets used to a certain place."

Sunan an-Nasa'i Book 12, Hadith 84