Musnad Ahmad 1153:653

Hassan ibn Musa narrated to us, Shaiban narrated to us, from Yahya, from Abu Hafsah, the freed slave of Aisha, that Aisha informed him that when the sun eclipsed during the time of the Messenger of Allah (peace and blessings of Allah be upon him), he performed ablution and gave an order, so it was called out: "The prayer is gathering." He stood and prolonged the standing in his prayer. She said: I think he recited Surah Al-Baqarah. Then he bowed and prolonged the bowing. Then he said: "Allah hears those who praise Him," then he stood for a duration similar to his [first] standing, and he did not prostrate. Then he bowed, then he prostrated. Then he stood and did the same as he had done. Then he bowed two bowings in one prostration [rak'ah], then he sat, and the sun cleared.