Surah Ghafir 40:19

يَعْلَمُ خَآئِنَةَ ٱلْأَعْيُنِ وَمَا تُخْفِى ٱلصُّدُورُ

He knows that which deceives the eyes and what the breasts conceal.

Translation: Saheeh International

Tafsir

He namely God knows the treachery of the eyes when it steals a glance at what is prohibited for it to look at and what the breasts hide — what the hearts hide.

Excerpt from Tafsir al-Jalalayn, commentary on 40:19, via Quran.com. The reader has the full commentary and 9 more tafsirs.