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 people of Mecca asked the Prophet ﷺ to show them a sign (miracle). So he showed them (the miracle) of the cleaving of the moon.  

سَأَلَ أَهْلُ مَكَّةَ أَنْ يُرِيَهُمْ آيَةً فَأَرَاهُمُ انْشِقَاقَ الْقَمَرِ  

[Machine] The people of Makkah asked the Messenger of Allah ﷺ to show them a miracle, so he showed them the splitting of the moon twice.  

أَنَّ أَهْلَ مَكَّةَ سَأَلُوا رَسُولَ اللهِ ﷺ أَنْ يُرِيَهُمْ آيَةً قَالَ فَأَرَاهُمْ انْشِقَاقَ الْقَمَرِ مَرَّتَيْنِ  

That the Meccan people requested Messenger of Allah ﷺ to show them a miracle, and so he showed them the splitting of the moon. (Using translation from Bukhārī 3637)  

أَنَّ أَهْلَ مَكَّةَ سَأَلُوا رَسُولَ اللهِ ﷺ أَنْ يُرِيَهُمْ آيَةً فَأَرَاهُمْ انْشِقَاقَ الْقَمَرِ مَرَّتَيْنِ