The New John Gill Exposition of the Entire BibleGenesis 18:22
And the men turned their faces from thence…
place to which Abraham brought them on; these were only two of them,
for the third continued with Abraham:
and went towards Sodom;
and are the two angels said to come thither at
evening, (Genesis 19:1) :
but Abraham stood yet before the Lord;
before the third person, whom
Abraham now began to know more clearly; he stood before him with all
reverence and humility, to hear what he had further to say to him, as
well as to say something to him himself; he stood "yet", he continued
to stand after the departure of the two angels that were gone to Sodom.
Onkelos and Jonathan paraphrase it,
``he ministered in prayer before the Lord.''