(7) باب سَجْدَةِ {إِذَا السَّمَاءُ انْشَقَّتْ}
Narrated Abu Salma:
I saw Abu Huraira reciting Idha-Sama' un-Shaqqat and he prostrated during its recitation. I asked Abu Huraira, "Didn't I see you prostrating?" Abu Huraira said, "Had I not seen the Prophet (ﷺ) prostrating, I would not have prostrated."
Reference: Sahih al-Bukhari 1074
In-book reference: Book 17, Hadith 8
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 19, Hadith 180