The law of Moses implies that God will become a man
It is recorded that God gave the law to the people of Israel by speaking the 10 Commandments from out of the fire on Mount Sinai. He spoke in an audible voice using words made of syllables that the people could hear with their ears. But the first thing anyone would do when he hears a voice is to look around to see who is talking. So the natural presumption would be to assume that there is a human figure that is speaking these human words. For by speaking, God is suggesting that He is enough like a man to use human speech. For we are made in God's image.
The five books of Moses, Genesis to Deuteronomy, do not go into great detail to define the nature and characteristics of God other than to say that God is the Creator of the universe and God can speak to men. The major portion of the books of Moses are spent on defining certain laws that God gave to Israel. And we are left to infer the nature of God by the nature of the laws He gave to Israel. Thus, the law defines the nature of God in terms of human deeds as if to say that God would do this, God would not do that, etc. And if the nature of God is defined in terms of human deeds, then this suggests that God may become a human.
By telling men to do some things and not others, God is implying that a man can know and do the Will of God just as He wishes. But in order to do the Will of God exactly as He intends in all circumstances, you must have the very Mind of God or the Spirit of God in order to know exactly what God would do. Yet, if God is a person, then the only one who can do God's Will perfectly all the time is God alone. Thus, God is implying that a man will be born who will do the Will of God just as He intended, and that man will have the very Mind and Spirit of God and so it will be right to call Him God. For if it were not possible for a man to perfectly do the Will of God, then God, to that extent, would knowingly be giving His commandments in vain.
It is more difficult to dispute that God will appear in the form of a human being when the only time the Scripture declares that people actually saw God is when they describe Him as having feet which is a human characteristic. This Vision of God is describe in Exodus 24:9-10 just after God gave Moses the law. And this is not an unimportant event since elsewhere Moses spend two chapters on God's appearing to him with the human characteristics of hands and a face and a back, Exodus 33:12-34:9.
Also, it seems obvious that God intends to speak to men as a man when God considered it a good idea that the people should rather hear the Word of God from a man than from out of a fire on a mountain. This desire is recorded in Exodus 18:14-19 when God promised that a prophet would come and declare everything that God commands.
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