Now the LORD appeared to him by the oaks of Mamre, while he was sitting at the tent door in the heat of the day. When he lifted up his eyes and looked, behold, three men were standing opposite him; and when he saw them, he ran from the tent door to meet them and bowed himself to the earth, Genesis 18:1-2
One of the most intriguing stories in the Bible is when Abraham cam face to face with the Lord Jesus Christ. First we notice it says the LORD appeared to Abraham. LORD in all caps is Yahweh meaning God. So God came in human form to meet Abraham. Since we know the Father is Spirit (John 4:24) and nobody has ever seen God (John 1:18) we know this is Jesus God in the flesh
Notice Jesus didn’t come alone he came with 2 angels. So Abraham saw three men (symbolic of the Trinity) and one of the men was Yahweh in the flesh. Abraham bowed down to Jesus. So notice Jesus didn’t rebuke Abraham for worshipping him as angels have previously rebuked people from bowing down to them (Revelation 22:8-9) (Colossians 2:18)
and said, “My lord, if now I have found favor in your sight, please do not pass your servant by. Genesis 18:3
Notice Abraham calls Jesus Lord and he also calls himself his servant.
He said, “I will surely return to you at this time next year; and behold, Sarah your wife will have a son.” And Sarah was listening at the tent door, which was behind him. Genesis 18:10
Jesus then delivers the prophecy of the birth of Isaac. This is significant for several reasons. First God promised to establish his covenant with Abraham through Isaac (Genesis 17:21) This is why Jesus reveals this to Abraham and Sarah. Second Isaac is the promised Son from God just as Jesus is the Son of God.
From this story in Genesis 18 its clears Abraham met God in the flesh and we know who he is Yeshua (Jesus ) Amen!