Israel Is My Son, My First-Born — Exodus 4:21–26
And Jehovah said unto Moses,
When thou goest back into Egypt, see that thou do before Pharaoh all the wonders which I have put in thy hand: but I will harden his heart and he will not let the people go.
And thou shalt say unto Pharaoh,
Thus saith Jehovah, Israel is my son, my first-born: and I have said unto thee, Let my son go, that he may serve me; and thou hast refused to let him go: behold, I will slay thy son, thy first-born.
EX 4:21–23
And it came to pass on the way at the lodging-place, that Jehovah met him, and sought to kill him.
EX 4:24
Then Zipporah took a flint, and cut off the foreskin of her son, and cast it at his feet; and she said,
Surely a bridegroom of blood art thou to me.
So he let him alone. Then she said,
A bridegroom of blood art thou, because of the circumcision.
EX 4:25–26