God’s Messenger used to recite the Qur'an to us, and when he came to a place where a prostration should be made he said “God is most great” and prostrated himself, and we prostrated ourselves along with him.
Ibn ‘Umar said that the Prophet made a prostration in the noon prayer, then stood up and bowed; and they thought he recite Tanzil, i.e. sura as-Sajda (Al-Qur’an; 32).
He said that in the year of the Conquest* God's Messenger recited a verse at which a prostration should be made and all the people prostrated themselves. Some were mounted, some were prostrating themselves on the ground, and those who were mounted prostrated themselves on their hands.
‘Uqba b. ‘Amir told that he said, “Messenger of God, sura al-Hajj has been given superior excellence through having two prostrations in it.” He replied, “Yes, and he who does not make the two prostrations should not recite the two verses.”
Abu Dawud and Tirmidhi transmitted it, and said this is a tradition whose isnad is not strong. Al-Masabih has “should not recite it”, as occurs in Sharh as-sunna.