Sahih Muslim
The Book Giving Description of the Day of Judgement, Paradise and Hell (Kitab Sifat Al-Qiyamah wal Janna wan-Nar)
Book Number: 039 / Hadith Number: 6724
Abu Ma'mar reported on the authority of Abdullah that the moon was split up during lifetime by Allah's Messenger (may peace be upon him) in two parts and Allah's Messenger (may peace be upon him) said: Bear testimony to this.