Messenger of Allah ﷺ said, "Gabriel recited the Qur'an to me in one way. Then I requested him (to read it in another way), and continued asking him to recite it in other ways, and he recited it in several ways till he ultimately recited it in seven different ways." (Using translation from Bukhārī 4991)
سَمِعْتُ هِشَامَ بْنَ حَكِيمِ بْنِ حِزَامٍ يَقْرَأُ فَذَكَرَ الْحَدِيثَ قَالَ مُحَمَّدٌ وَحَدَّثَنِي عُبَيْدُ اللهِ بْنُ عَبْدِ اللهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ أَنَّ ابْنَ عَبَّاسٍ حَدَّثَهُ أَنَّ رَسُولَ اللهِ ﷺ قَالَ أَقْرَأَنِي جِبْرِيلُ عَلَى حَرْفٍ فَرَاجَعْتُهُ فَلَمْ أَزَلْ أَسْتَزِيدُهُ وَيَزِيدُنِي حَتَّى انْتَهَى إِلَى سَبْعَةِ أَحْرُفٍ