Abu Dawud Book 2, Hadith Number 1402.
Chapter : Prostration in suras inshiqaq (84) and iqra (96).
Narated By Abu Hurairah : We prostrated along with the Apostle of Allah (PBUH) on the account of: “When the sky is rent asunder” (lxxxiv) and “Recite in the name of the Lord Who created.(xcvi)”