And Moses took his wife and his sons and set them on donkeys, and he returned to the land of Egypt; and Moses took the rod of God in his hand. And the Lord said to Moses, When you return into Egypt, see that you do before Pharaoh all those miracles and wonders which I have put in your hand; but I will make him stubborn and harden his heart, so that he will not let the people go. And you shall say to Pharaoh, Thus says the Lord, Israel is My son, even My firstborn. read more.
And I say to you, Let My son go, that he may serve Me; and if you refuse to let him go, behold, I will slay your son, your firstborn. Along the way at a [resting-] place, the Lord met [Moses] and sought to kill him [made him acutely and almost fatally ill]. [Now apparently he had failed to circumcise one of his sons, his wife being opposed to it; but seeing his life in such danger] Zipporah took a flint knife and cut off the foreskin of her son and cast it to touch [Moses'] feet, and said, Surely a husband of blood you are to me! When He let [Moses] alone [to recover], Zipporah said, A husband of blood are you because of the circumcision.