وَكَفَى بِرَبِّكَ بِذُنُوبِ عِبَادِهِ خَبِيرَا بَصِيرًا
(And sufficient is your Lord as All-Knower and Seer of the sins of His servants.) means, He knows everything they do, good and evil, and nothing at all is hidden from Him, may He be glorified and exalted.
