Jabir narrated that :
the Prophet (ﷺ) said: "When one of you prostrates, then let him be balanced, and let him not lay his forearms down like the lying of the dog."
Anas narrated that :
Allah's Messenger (ﷺ) said: "Be balanced in the prostration, and let one of you not spread his forearms (on the ground) in the Salat like the spreading of the dog."