(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)). "
Reference: Sunan an-Nasa'i 965
In-book reference: Book 11, Hadith 90
English translation: Vol. 2, Book 11, Hadith 966