'For Us' in the Bible

They said, "An Egyptian delivered us out of the hand of the shepherds, and moreover he drew water for us, and watered the flock."

Isn't this the word that we spoke to you in Egypt, saying, 'Leave us alone, that we may serve the Egyptians?' For it were better for us to serve the Egyptians, than that we should die in the wilderness."

Moses said to Joshua, "Choose men for us, and go out, fight with Amalek. Tomorrow I will stand on the top of the hill with God's rod in my hand."

He said to the elders, "Wait here for us, until we come again to you. Behold, Aaron and Hur are with you. Whoever is involved in a dispute can go to them."