(27) بَابُ سُؤَالِ الْمُشْرِكِينَ أَنْ يُرِيَهُمُ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ آيَةً فَأَرَاهُمُ انْشِقَاقَ الْقَمَرِ
Narrated Anas:
That the Meccan people requested Allah's Messenger (ﷺ) to show them a miracle, and so he showed them the splitting of the moon.
Reference: Sahih al-Bukhari 3637
In-book reference: Book 61, Hadith 141
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 56, Hadith 831