Tafsir of Al-Anbiya' 21:110

Verily, He (Allah) knows that which is spoken aloud (openly) and He knows that which you conceal. Allah knows the Unseen in its entirety; He knows what His creatures do openly and what they do secretly. He knows what is visible and what is concealed; He knows what is secret and hidden. He knows what His creatures do openly and in secret, and He will requite them for that, for both minor and major actions

وإن أدري لعله فتنة لكم ومتاع إلى حين