Tafsir of Al-Ahzab 33:54

Whether you reveal anything or conceal it, verily, Allah is Ever All-Knower of everything. meaning, `whatever you conceal in your innermost thoughts, it is not hidden from Him at all.'

يعلم خاينة اﻻعين وما تخفى الصدور

Allah knows the fraud of the eyes, and all that the breasts conceal. (40:19)