Exodus:4:22-23
gltv@Exodus:4:22 @ And you shall speak to Pharaoh, So says Jehovah, My son, My first-born is Israel.
gltv@Exodus:4:23 @ And I said to you, Send My son away, and let him serve Me; and you refused to send him. Behold, I am about to kill your son, your first-born!