Musannaf Ibn Abi Shaybah 6026 — One who has missed a rakah and whom

Al-Hasan was asked: A man missed one rak'ah and then joined the prayer; the imam's ablution broke, so he took this follower by the hand and put him forward. What should he now do? Al-Hasan said: He should pray one rak'ah and sit, then build on the people's prayer. When he has led them in four rak'ahs, he should sit and recite the tashahhud, then take a man by the hand and put him forward; when that man gives the salam, he should stand up and pray the rak'ah he missed.