Oaks of Mamre Explanation

And after the three appearances, Finally God visited Abraham as a three person(Trinity God), and Abraham asked all three of them to stay under the tree, Here the tree represent the Cross where Christ crucified for our Salvation - 1.And the Lord appeared to him by the oaks of Mamre, as he sat at the door of his tent in the heat of the day. 2.He lifted up his eyes and looked, and behold, three men were standing in front of him. When he saw them, he ran from the tent door to meet them and bowed himself to the earth 3.and said, “O Lord, if I have found favor in your sight, do not pass by your servant. 4.Let a little water be brought, and wash your feet, and rest yourselves under the tree, 5.while I bring a morsel of bread, that you may refresh yourselves, and after that you may pass on—since you have come to your servant.” So they said, “Do as you have said.” 6.And Abraham went quickly into the tent to Sarah and said, “Quick! Three seahs of fine flour! Knead it, and make cakes.” 7.And Abraham ran to the herd and took a calf, tender and good, and gave it to a young man, who prepared it quickly. 8.Then he took curds and milk and the calf that he had prepared, and set it before them. And he stood by them under the tree while they ate - Genesis 18:1-8

Since Christ is the image of Trinity God, the prophecy called him in plural as Sons - 6.I said, You are Gods, Sons of the Most High, all of you, 7.But you shall die like men, And fall like one of the princes - Psalm 82:6-7

And Christ's trinity also referred him as an Angels of God - 10.Jacob left Beersheba and went toward Haran. 11.And he came to a certain place and stayed there that night, because the sun had set. Taking one of the stones of the place, he put it under his head and lay down in that place to sleep. 12.And he dreamed, and behold, there was a ladder set up on the earth, and the top of it reached to heaven. And behold, the angels of God were ascending and descending on it! 13.And behold, the Lord stood above it and said, “I am the Lord, the God of Abraham your father and the God of Isaac. The land on which you lie I will give to you and to your offspring - Genesis 28:10-13

Christ also confirmed the Angles of God is referring him only - And he said to him, “Truly, truly, I say to you, you will see heaven opened, and the angels of God ascending and descending on the Son of Man.” - John 1:51