Musnad Ahmad 30:253

Sufyan narrated to us, from Yahya ibn Sa'id, from Abu Bakr al-Ansari, from Umar ibn Abd al-Aziz, from Abu Bakr al-Makhzumi, from Abu Hurairah, that the Prophet, peace and blessings of Allah be upon him, prostrated in "When the sky has split open" (Surah Al-Inshiqaq) and "Read" (Surah Al-'Alaq).