Sahih Muslim 2800
Sahih Muslim · Book 52: Characteristics of the Day of Judgment, Paradise, and Hell · The Splitting Of The Moon
'Abdullah b. Mas'ud reported that the moon was split up in two parts during the lifetime of Allah's Messenger (ﷺ). The mountain covered one of its parts and one part of it was above the mountain and Allah's Messenger (ﷺ) said:
حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ الْعَنْبَرِيُّ ، حَدَّثَنَا أَبِي ، حَدَّثَنَا شُعْبَةُ ، عَنِ الأَعْمَشِ ، عَنْ إِبْرَاهِيمَ ، عَنْ أَبِي مَعْمَرٍ ، عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ ، قَالَ انْشَقَّ الْقَمَرُ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فِلْقَتَيْنِ فَسَتَرَ الْجَبَلُ فِلْقَةً وَكَانَتْ فِلْقَةٌ فَوْقَ الْجَبَلِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " اللَّهُمَّ اشْهَدْ " .
Bear witness to this.