We were along with Messenger of Allah ﷺ at Mina, that moon was split up into two. One of its parts was behind the mountain and the other one was on this side of the mountain. Messenger of Allah (may peace be upbn him) said to us: Bear witness to this.
بَيْنَمَا نَحْنُ مَعَ رَسُولِ اللَّهِ ﷺ بِمِنًى إِذَا انْفَلَقَ الْقَمَرُ فِلْقَتَيْنِ فَكَانَتْ فِلْقَةٌ وَرَاءَ الْجَبَلِ وَفِلْقَةٌ دُونَهُ فَقَالَ لَنَا رَسُولُ اللَّهِ ﷺ اشْهَدُوا
"We were with the Messenger of Allah ﷺ in Mina, when the moon was cleft asunder into two parts. Part of it was behind the mountain, and part of it before it. The Messenger of Allah ﷺ said to us: 'Bear witness' meaning: The house has drawn near, and the moon has been cleft asunder (54:1)."
بَيْنَمَا نَحْنُ مَعَ رَسُولِ اللَّهِ ﷺ بِمِنًى فَانْشَقَّ الْقَمَرُ فِلْقَتَيْنِ فِلْقَةٌ مِنْ وَرَاءِ الْجَبَلِ وَفِلْقَةٌ دُونَهُ فَقَالَ لَنَا رَسُولُ اللَّهِ ﷺ اشْهَدُوا يَعْنِي (اقتَرَبَتِ السَّاعَةُ وَانْشَقَّ الْقَمَرُ ) قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ