Musnad Ahmad 28:392

'Abd al-Razzaq narrated to us, Sufyan informed us, from 'Ata' ibn al-Sa'ib, from his father, from 'Abdullah ibn 'Amr, that the Prophet (peace and blessings of Allah be upon him) prayed with them on the day the sun eclipsed, the day his son Ibrahim died. He stood with the people, and it was said: "He will not bow," but he bowed. Then it was said: "He will not rise," but he rose. Then it was said: "He will not prostrate," but he prostrated. Then it was said: "He will not rise," but he stood up for the second [rak'ah]. He did the same as that, and the sun cleared.