Exo 3:11-12
To the divine commission Moses made this reply: “Who am I, that I should go to Pharaoh, and bring forth the children of Israel out of Egypt?” Some time before he had offered himself of his own accord as a deliverer and judge; but now he had learned humility in the school of Midian, and was filled in consequence with distrust of his own power and fitness. The son of Pharaoh’s daughter had become a shepherd, and felt himself too weak to go to Pharaoh. But God met this distrust by the promise, “I will be with thee,” which He confirmed by a sign, namely, that when Israel was brought out of Egypt, they should serve (עבד, i.e., worship) God upon that mountain. This sign, which was to be a pledge to Moses of the success of his mission, was one indeed that required faith itself; but, at the same time, it was a sign adapted to inspire both courage and confidence. God pointed out to him the success of his mission, the certain result of his leading the people out: Israel should serve Him upon the very same mountain in which He had appeared to Moses. As surely as Jehovah had appeared to Moses as the God of his fathers, so surely should Israel serve Him there. The reality of the appearance of God formed the pledge of His announcement, that Israel would there serve its God; and this truth was to till Moses with confidence in the execution of the divine command. The expression “serve God” (λατρεύειν τῷ Θεῷ, lxx) means something more than the immolare of the Vulgate, or the “sacrifice” of Luther; for even though sacrifice formed a leading element, or the most important part of the worship of the Israelites, the patriarchs before this had served Jehovah by calling upon His name as well as offering sacrifice. And the service of Israel at Mount Horeb consisted in their entering into covenant with Jehovah (Exo 24); ); not only in their receiving the law as the covenant nation, but their manifesting obedience by presenting free-will offerings for the building of the tabernacle (Exo 36:1-7; Num 7:1).