The people of Mecca asked Messenger of Allah ﷺ to show them a miracle. So he showed them the moon split in two halves between which they saw the Hira' mountain.  

أَنَّ أَهْلَ مَكَّةَ سَأَلُوا رَسُولَ اللَّهِ ﷺ أَنْ يُرِيَهُمْ آيَةً فَأَرَاهُمُ الْقَمَرَ شِقَّتَيْنِ حَتَّى رَأَوْا حِرَاءً بَيْنَهُمَا  

The moon was split ( into two pieces ) while we were with the Prophet ﷺ in Mina. He said, "Be witnesses." Then a Piece of the moon went towards the mountain.  

انْشَقَّ الْقَمَرُ وَنَحْنُ مَعَ النَّبِيِّ ﷺ بِمِنًى فَقَالَ اشْهَدُوا وَذَهَبَتْ فِرْقَةٌ نَحْوَ الْجَبَلِ وَقَالَ أَبُو الضُّحَى عَنْ مَسْرُوقٍ عَنْ عَبْدِ اللَّهِ انْشَقَّ بِمَكَّةَ وَتَابَعَهُ مُحَمَّدُ بْنُ مُسْلِمٍ عَنِ ابْنِ أَبِي نَجِيحٍ عَنْ مُجَاهِدٍ عَنْ أَبِي مَعْمَرٍ عَنْ عَبْدِ اللَّهِ  

During the lifetime of Messenger of Allah ﷺ the moon was split (into two places).  

أَنَّ الْقَمَرَ انْشَقَّ عَلَى زَمَانِ رَسُولِ اللَّهِ ﷺ  

The moon was split (into two pieces).  

انْشَقَّ الْقَمَرُ