Narrated Ibn 'Umar:
"The moon was split during the time of the Messenger of Allah (ﷺ). So the Messenger of Allah (ﷺ) said: 'Bear witness.'" (ES)
English reference (ES): Vol. 5, Book 44, Hadith 3288 (ES)
Arabic reference (ES): Book 47, Hadith 3599 (ES)