The Bible
Exodus 4
The Lord gives signs to Moses—Aaron is chosen as a spokesman—Israel is the Lord’s firstborn and must be released to serve Him—Moses’ son is circumcised—Moses and Aaron lead Israel in worship.
2And the Lord said unto him, What is that in thine hand? And he said, A rod.
12Now therefore go, and I will be with thy mouth, and teach thee what thou shalt say.
13And he said, O my Lord, send, I pray thee, by the hand of him whom thou wilt send.

17And thou shalt take this rod in thine hand, wherewith thou shalt do signs.
22And thou shalt say unto Pharaoh, Thus saith the Lord, Israel is my son, even my firstborn:
24¶ And it came to pass by the way in the inn, that the Lord met him, and sought to kill him.
26So he let him go: then she said, A bloody husband thou art, because of the circumcision.
29¶ And Moses and Aaron went and gathered together all the elders of the children of Israel: