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https://www.esm.us/wp-content/uploads/2021-01-16.notes_Sat.pdf
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Exodus 3:2 And the angel of the LORD appeared to him in a flame of fire out of the middle of a bush: and he looked, and behold, the bush burned with fire, and the bush was not consumed.
Exodus 6:2,3 The LORD said to Moses, Now you shall see what I will do to Pharaoh, for by a strong hand he shall let them go, and by a strong hand he shall drive them out of his land. God spoke to Moses, and said to him, I am the LORD; and I appeared to Abraham, to Isaac, and to Jacob, as God Almighty; but by my name the LORD I was not known to them.
Genesis 12:7,8 And the LORD appeared to Abram, and said, To your seed will I give this land: and there built he an altar unto the LORD, who appeared to him. And he removed from there to a mountain on the east of Bethel, and pitched his tent, having Bethel on the west, and Hai on the east: and there he built an altar to the LORD, and called upon the name of the LORD.