7. Prayer (Kitab Al-Salat) Prostration while reciting the Qur'an - كتاب سجود القرآن
4) Chapter: Prostration In Surah's Inshiqaq And Iqra'
Narrated Abu Hurairah:
We prostrated ourselves along with the Messenger of Allah (ﷺ) on account of: "When the sky is rent asunder" and "Recite in the name of Your Lord Who created"