GENESIS CHAPTER 18
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Verse 1,
  Plain = 'elown {ay-lone'}
    1) tree, great tree, terebinth
    2) plain
  Mamre = "strength" or "fatness"
    2) an oak grove on Mamre's land in Palestine where Abraham
      dwelt
  LORD appeared unto Abraham
    Jehovah = "the existing One"

Verse 2, Three men, which were angels: see 19:1
  Some have said that these may be the three persons of the
  Trinity, which is very unlikely, since the Holy Spirit and the
  Father have never appeared in human form.
    Joh 5:37  And the Father himself, which hath sent me, hath
      borne witness of me. Ye have neither heard his voice at any
      time, nor seen his shape.

Verse 3, Abraham knows that they are of the Lord

Verses 4-8, Abraham asks them to rest, wash and eat, which they
  did; so they appeared as men. When they went down to Sodom in
  chapter 19 the men of Sodom wanted to know them.

Verses 9-12, The Lord (the Son of God in human form) says that
  Sarah will have a son.
  "Time of life" - Time of the birth of Isaac
  When Sarah heard this she laughed WITHIN herself, because of
  her age and the age of Abraham. We know that she laughed within
  herself because she denied laughing in verse 15.

Verses 13-14, Nothing is too hard for the Lord to do.

Verse 15, Sarah denies laughing within herself, but the Lord knew
  that she had laughed.

Verses 16-22, The Lord reveals to Abraham what He will do to
  Sodom, because of their wickedness.
  Verse 19 shows the connection between the promises and
  righteousness. Not that the promises were a result of the
  righteousness, but rather righteousness is consequences of the
  promises. That righteousness would be worked in Abraham.

  Verse 21 is spoken after the manner of men, for God knows all
  that went on in Sodom. Perhaps he will observe their wickedness
  in human form, as a witness against them.

  In verse 22, two of the angels continue on toward Sodom, but
  the Lord continued to talk with Abraham. We see in 19:1 that it
  was TWO angels that came to Sodom at evening.

Verses 23-33, Abraham intercedes with the LORD for Sodom. He knew
  that his brother's son, Lot, was there.
  50, 45, 40, 30, 20, 10.
  In these verses we do see that God spares the wicked, for a
  time, for the sake of the righteous.