So God passed judgment on their Gods and killed their first born because they enslaved Israel who was kicked their first born (of God), as it is written “Israel is my first born son.” (Exodus 4:22) This is also how God warned the Egyptians at first: “Behold I will kill your first born sons” (Exodus 4:23). So “If they had killed their first born and not given us their wealth, it would have been enough of a miracle for us!”