Tafsiran Kejadian 18:2: Rashi, Ramban, Radak & Sforno

והנה שלשה אנשים AND BEHOLD THREE MEN — one to announce to Sarah the birth of a son, one to overthrow Sodom, and one to cure Abraham, for one angel does not carry out two commissions (Genesis Rabbah 50:2). You may know that this is so because throughout this section it (Scripture) mentions them in the plural — “and they ate” (Genesis 18:8), “and they said unto him” (Genesis 18:9) — whilst in the case of the announcement it states, (Genesis 18:10) “And he said, I will certainly return unto thee”, and with regard to the overthrow of Sodom it says (Genesis 19:22) “For “I” cannot do anything” and (Genesis 19:21) “that “I” will not overthrow [the city]”. Raphael who healed Abraham went thence to rescue Lot; that explains what is stated (Genesis 19:17) “And it came to pass when they had brought them forth, that he said, Escape for thy life”, for you learn from this that only one of these acted as Deliverer

STOOD OVER HIM. The purport thereof is that they were standing opposite Abraham and looking at him, the expression being similar to: that stood over the reapers;⁶⁹Ruth 2:6. the chief officers that stood over the work.⁷⁰I Kings 5:30. And due to the fact that he [Abraham] was sitting and they were standing and looking at him, the verse says, “over him.” This is also the meaning of the expression, And he saw, and ran to meet them, for as he saw them standing opposite him and not continuing their journey, he ran to meet them in order to bring them to his house.
The sense of the expression, From the tent door, is that Abraham was still sitting there after the vision of the Shechinah had departed from him.
It is possible that the expression “over him” refers to the tent, i.e., that they were near it on the side which was not opposite the door, and there they stood and did not approach Abraham, just as in the verse, encamping ‘al’ (on) the sea.⁷¹Exodus 14:9. Meaning “encamping alongside the sea.” Here too alav means “standing alongside him.”

וישא את עיניו, the first thing Avraham saw after he had gone to sleep were three men standing next to him, נצבים עליו, apparently ready to be of service to him. The meaning of the expression נצבים עליו is similar to Samuel I 22,7 ויאמר שאול לעבדיו הנצבים עליו, “Saul said to the people standing next to him (in attendance) etc.” The same expression is also used in this context in Ruth 2,6 הנצב על הקוצרים, “who was standing next to the reapers;” we also find this expression in Kings I 5,30 "משרי הנצבים, and in numerous other places in Scripture. These three men beheld by Avraham were standing at his disposal. They did not move, but indicated that they were expecting instructions from him. When he realised this he ran toward them. This explains why the word וירא, “he saw” appears twice in this verse in close succession.