Musnad Ahmad 30:278

Sufyan narrated to us, Ayyub ibn Musa informed us, from ‘Ata’ ibn Mina’, I heard Abu Hurairah saying: "I prostrated with the Prophet, may Allah bless him and grant him peace, during [the recitation of] 'When the sky has split [asunder]' (Surah Al-Inshiqaq) and 'Recite in the name of your Lord' (Surah Al-‘Alaq)."