Ibn Kathir (Abridged) Tafsir: An-Náhl Ayah 19

Allah tells us that He knows what is hidden in people's hearts as well as what is apparent. He will reward or punish everyone for their deeds on the Day of Resurrection. If their deeds are good then they will be rewarded, and if their deeds are evil, then they will be punished.

The gods of the Idolators are created; they do not create

Then Allah tells us that the idols which people call on instead of Him cannot create anything; they are themselves created, as Al-Khalil (Ibrahim) said:

("Do you worship that which you (yourselves) carve, while Allah has created you and what you make!") (37:95-96).

((They are) dead, not alive) means, they are inanimate and lifeless; they do not hear, see, or think.

(and they know not when they will be resurrected.) Meaning, they do not know when the Hour will come, so how can anyone hope for any benefit or reward from these idols? They should hope for it from the One Who knows all things and is the Creator of all things.