Jesus appeared to Abram, along with the 2 Angels that looked like men, though they were not men, they are described as angels. These angels looked so good to the people of Sodom they wanted to "know them" Biblical term for have sex with them. These angels were with the being who would become known as Jesus, when these Sodomites tried to break the door down to get at these 2 angels the angels blinded these people, they fled Sodom and it was burned up.

Jesus appeared before this also. There are more verses.

Gen 18:1
And the LORD appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day;

Gen 18:3
And said, My Lord, if now I have found favour in thy sight, pass not away, I pray thee, from thy servant:

Gen 21:1
And the LORD visited Sarah as he had said, and the LORD did unto Sarah as he had spoken.