(51) باب السُّجُودِ فِي { إِذَا السَّمَاءُ انْشَقَّتْ }
It was narrated that Abu Hurairah said:
"Abu Bakr and Umar prostrated during: 'When the heaven is split asunder,' as did the one who was better than them (the Prophet (ﷺ)). " (ID)
Reference (ID): Sunan an-Nasa'i 965 (ID)
In-book reference (ID): Book 11, Hadith 90 (ID)
English translation (ID): Vol. 2, Book 11, Hadith 966 (ID)