Surah 'Abasa 80:3

وَمَا يُدْرِيكَ لَعَلَّهُۥ يَزَّكَّىٰٓ

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

Translation: Saheeh International

Tafsir

And how would you know? Perhaps he would cleanse himself yazzakkā the original tā’ of yatazakkā has been assimilated with the zāy that is perhaps he would purge himself of sins by what he hears from you

Excerpt from Tafsir al-Jalalayn, commentary on 80:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.