﴿ وَٱللَّهُ أَعْلَمُ بِمَا يُوعُونَ ﴾

“Yet God has full knowledge of what they conceal [in their hearts].”

(And Allah knoweth best what they are hiding) and Allah knows best what they say and do; and it is also said this means: Allah knows best what they hear and hide in their hearts.