"The Prophet ordered placing the hands (on the ground) keeping the feet erect. (by resting feet on the toes and making the tips of the toes facing the Qiblah)."
Jami` at-Tirmidhi Book 2, Hadith 129
← Previous Hadith Allah's Messenger 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."

Jami` at-Tirmidhi Book 2, Hadith 128 Next Hadith → "The Prophet ordered placing the hands (on the ground)." And he mentioned in it: "From his father."

Jami` at-Tirmidhi Book 2, Hadith 130