(Prostrating For) Forgetfulness After The Two Prostrations (Rak'ah) Sunan Abi Dawud 1009
Translation
This tradition has been narrated through a different chain of transmitters; but the version of Hammad is more perfect. This version goes; then the Messenger of Allah (ﷺ) prayed; it does not have the words, “led us (in prayer),” nor the words “they made a sign”. Thereupon the people said
Abu Dawud said: And everyone who narrated this hadith did not say, "Then he said the takbir," nor did he mention, "He returned."