﴿ يَعْلَمُ خَآئِنَةَ ٱلْأَعْيُنِ وَمَا تُخْفِى ٱلصُّدُورُ ﴾

“[for] He is aware of the [most] stealthy glance, and of all that the hearts would conceal.”

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.