Sunan Abi Dawud

Al-Bara (b. Azib)said; They (the Companions) used to pray along with the Messenger of Allah (ﷺ). When he bowed, they bowed; and when he said, “Allah listens to him who praises him”, they remained standing until they saw that he placed his placed his forehead on the ground:then they would follow him (ﷺ)