Genesis 18:2

“And he lifted up his eyes and looked, etc.] To see if he could observe any passengers coming that way: and, lo, three men stood by him; having perhaps descended at once from heaven upon the spot near where Abraham sat; for these, whoever they were, appeared in an human form, and they were took by Abraham at first sight to be men, and as such he treated them: some have taken these to be the three divine Persons, as some of the ancients; of which opinion was Dr. Lightfoot, who expressly says f1111, “three months after this, (i.e. the institution of the circumcision,) the three Persons in the Trinity dine with Abraham, and foretell the birth of Isaac; again, the Son and the Holy Ghost go down…”

“lift up his eyes . . . and, lo, three men--Travellers in that quarter start at sunrise and continue till midday when they look out for some resting-place. he ran to meet them--When the visitor is an ordinary person, the host merely rises; but if of superior rank, the custom is to advance a little towards the stranger, and after a very low bow, turn and lead him to the tent, putting an arm round his waist, or tapping him on the shoulder as they go, to assure him of welcome.”

“- The Visit of the Lord to Abraham 2. השׂתחיה vayı̂śtachû “bow,” or bend the body in token of respect to God or man. The attitude varies from a slight inclination of the body to entire prostration with the forehead touching the ground. 6. סאה se'ah a “seah,” about an English peck, the third part of an ephah. The ephah contained ten omers. The omer held about five pints. This chapter describes Abraham’s fellowship with God. On the gracious assurance of the Redeemer and Vindicator, “Fear not, I am thy shield and thy exceeding great reward,” he ceased to fear, and believed. On the solemn announcement of the Conqueror of evil and the Quickener of the dead, “I am God Almighty; walk before me…”

“18:2-8 Abraham received his visitors as very important guests, perhaps realizing that they were messengers from God.”