Exodus 4:22-24

Revised Standard Version

²² And you shall say to Pharaoh, ‘Thus says the Lord, Israel is my first-born son, ²³ and I say to you, “Let my son go that he may serve me”; if you refuse to let him go, behold, I will slay your first-born son.’”

²⁴ At a lodging place on the way the Lord met him and sought to kill him.