In the name of the Father and of the +Son and of the Holy Spirit, Amen.
When the Lord called Moses He did it on Mount Sinai (A.K.A. Horeb) in a burning bush. (Exod. 3:1-6) He told Moses, “I will be with you and here is the sign of My sending you: you will know I have sent you when you come back here with My people and you serve Me on this mountain. Then you’ll know it was Me who sent you.” (Exod. 3:12) In other words, “When you have done it, you know I sent you to do it.” So the Lord was with him. It gets done, for the Lord sent Him, and they come back to the mountain where the Lord reveals who He is to Moses in 10 words or commandments.