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.'" (ID)
English reference (ID): Vol. 5, Book 44, Hadith 3288 (ID)
Arabic reference (ID): Book 47, Hadith 3599 (ID)