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  

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