Exodus 4:20

Then she gave birth to a son, and he named him Gershom, for he said, “I have been a sojourner in a foreign land.”

And Yahweh said to him, “What is this in your hand?” And he said, “A staff.”

“And you shall take in your hand this staff, with which you shall do the signs.”

“As for you, raise up your staff and stretch out your hand over the sea and split it, and the sons of Israel shall go through the midst of the sea on dry land.

So Moses said to Joshua, “Choose men for us and go out, fight against Amalek. Tomorrow I will take my stand on the top of the hill with the staff of God in my hand.”

and her two sons, of whom one was named Gershom, for Moses said, “I have been a sojourner in a foreign land.”

“Take the rod; and you and your brother Aaron assemble the congregation and speak to the rock before their eyes, that it may yield its water. You shall thus bring forth water for them out of the rock and let the congregation and their beasts drink.”