Musnad Ahmad 30:659

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Ayyub, from Ibn Sirin, that Abu Hurayrah used to prostrate in it. Abu Hurayrah said: "And I saw the Messenger of Allah, peace and blessings of Allah be upon him, prostrate in it," meaning when "The sky has split [asunder]" (Surah Al-Inshiqaq).