Genesis 18:3

“And said, my Lord, etc.] He addressed himself to one of them who appeared to him to be the greatest and most honourable, either by the appearance of his countenance, or by his dress, or by the situation in which he was between the other two, and by their carriage and behaviour to him: if now I have found favour in thy sight; signifying he should esteem it an honour done him, that he and his companions would vouchsafe to stop and refresh themselves: pass not away, I pray thee, from thy servant; they might seem, by some motion they made, as if they were going another way, and declined turning in to him.”

“My Lord, if now I have found favor--The hospitalities offered are just of the kind that are necessary and most grateful, the refreshment of water, for feet exposed to dust and heat by the sandals, being still the first observed among the pastoral people of Hebron.”

“- 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…”

“18:3 My lord: The Hebrew text uses ’adonay (“Lord”), the word that is usually reserved for God. In Hebrew tradition, it was spoken in places where the holy name Yahweh (the Lord) was in the text. Perhaps the text uses ’adonay rather than the more common ’adoni to show that this was the angel of the Lord—i.e., the Lord himself (see study note on 16:7). We don’t know whether Abraham knew his visitors’ identity at the outset, but by the story’s end Abraham certainly knew he had been talking with God.”