(27) بَابُ سُؤَالِ الْمُشْرِكِينَ أَنْ يُرِيَهُمُ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ آيَةً فَأَرَاهُمُ انْشِقَاقَ الْقَمَرِ
Narrated `Abdullah bin Masud:
During the lifetime of the Prophet (ﷺ) the moon was split into two parts and on that the Prophet (ﷺ) said, "Bear witness (to thus).
Reference: Sahih al-Bukhari 3636
In-book reference: Book 61, Hadith 140
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 56, Hadith 830