Sahih al-Bukhari 4866
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · "...And the moon has been cleft asunder (the people of Makkah requested Prophet Muḥammad pbuh to show them a miracle, so he showed them the splitting of the moon). And if they see a sign, they turn away..." (V.54:1,2)
Narrated Ibn `Abbas:
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ ، قَالَ حَدَّثَنِي بَكْرٌ ، عَنْ جَعْفَرٍ ، عَنْ عِرَاكِ بْنِ مَالِكٍ ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ انْشَقَّ الْقَمَرُ فِي زَمَانِ النَّبِيِّ صلى الله عليه وسلم.
The moon was cleft asunder during the lifetime of the Prophet.