Surah 'Abasa, verse 1

أَن جَآءَهُ ٱلْأَعْمَىٰ ﴿٢﴾

Because there came to him the blind man, [interrupting].

وَمَا يُدْرِيكَ لَعَلَّهُۥ يَزَّكَّىٰٓ ﴿٣﴾

But what would make you perceive, [O Muḥammad], that perhaps he might be purified