John Wesley on Acts 12:23

And immediately - God does not delay to vindicate his injured honour; an angel of the Lord smote him - Of this other historians say nothing: so wide a difference there is between Divine and human history! An angel of the Lord brought out Peter; an angel smote Herod. Men did not see the instruments in either case. These were only known to the people of God. Because he gave not glory to God - He willingly received it to himself, and by this sacrilege filled up the measure of his iniquities. So then vengeance tarried not. And he was eaten by worms, or vermin - How changed! And on the fifth day expired in exquisite torture. Such was the event! The persecutor perished, and the Gospel grew and multiplied.