וַיַּ֥עַן הַמַּלְאָ֖ךְ וַיֹּ֣אמֶר אֵלָ֑י אֵ֗לֶּה אַרְבַּע֙ רֻח֣וֹת הַשָּׁמַ֔יִם יוֹצְא֕וֹת מֵֽהִתְיַצֵּ֖ב עַל־אֲד֥וֹן כָּל־הָאָֽרֶץ׃
האָט דער מלאך געענטפֿערט און האָט געזאָגט צו מיר: די דאָזיקע גײען אַרױס צו די פֿיר װינטן פֿֿון הימל, נאָך דעם װי זײ האָבן זיך געשטעלט פֿאַר דעם האַר פֿֿון דער גאַנצער ערד.
Radak
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.