Original Verse:
Genesis Chapter 18 Verse 1And Jehovah appeared unto him by the oaks of Mamre, as he sat in the tent door in the heat of the day;

Reference Verses:
Genesis Chapter 17 Verse 1And when Abram was ninety years old and nine, Jehovah appeared to Abram, and said unto him, I am God Almighty; walk before me, and be thou perfect.
Genesis Chapter 13 Verse 18And Abram moved his tent, and came and dwelt by the oaks of Mamre, which are in Hebron, and built there an altar unto Jehovah.
Genesis Chapter 14 Verse 13And there came one that had escaped, and told Abram the Hebrew: now he dwelt by the oaks of Mamre, the Amorite, brother of Eshcol, and brother of Aner; and these were confederate with Abram.
Genesis Chapter 35 Verse 27And Jacob came unto Isaac his father to Mamre, to Kiriath-arba (the same is Hebron), where Abraham and Isaac sojourned.