Musannaf Ibn Abi Shayba 3:3517

Abu Bakr narrated to us, he said: Mu'tamir ibn Sulayman narrated to us, from Salim ibn Abi al-Dhayyal, from al-Hasan, regarding a man who is preceded by a rak'ah (misses a rak'ah), then the Imam breaks his wudu (hadatha), so he takes the hand of the one who was preceded and brings him forward: How should he act? He said: He said: He should pray a rak'ah and sit, then he should complete the prayer of the people. When he has completed four [rak'ahs] with them, he should sit and recite the tashahhud, then take the hand of a man and perform the taslim. Then the man should stand and pray the rak'ah that he was preceded by.