Tafsir of Al-Anbiya' 21:110

(Indeed, He knows the spoken word), meaning what you declare openly of disparagement against Islam and the denial of the verses, among which is that which spoke of the coming of the promised one. (And He knows what you conceal) of rancor and hatred toward the Muslims; so He will recompense you for it, down to the last naqir (speck on a date stone) and qitmir (the thin membrane around a date seed).