וַיְהִי֩ אִ֨ישׁ אֶחָ֧ד מִצָּרְעָ֛ה מִמִּשְׁפַּ֥חַת הַדָּנִ֖י וּשְׁמ֣וֹ מָנ֑וֹחַ וְאִשְׁתּ֥וֹ עֲקָרָ֖ה וְלֹ֥א יָלָֽדָה׃
소라 땅에 단 지파의 가족 중 마노아라 이름하는 자가 있더라 그 아내가 잉태하지 못하므로 생산치 못하더니
Or HaChaim
The expression אנשים נצבים may allude to the human posture these angels assumed. The word עליו means "on his account," i.e. for his sake, so that he could perform the מצוה of hospitality. Abraham realised that they were angels because the bearing of an angel cannot be disguised. We know this already from the wife of Manoach (Judges 13,2). If that lady realised that she faced an angel, someone of Abraham's stature would certainly be aware of the presence of an angel. After all, Abraham had already encountered angels previously. The word וירא a second time merely confirmed Abraham's original impression seeing that he had been healed and was able to run towards them. An angel has long-distance vision and inasmuch as the cure he performs is of a spiritual nature, he does not need to be physically close to the patient. As soon as Abraham felt cured, he bowed down to the angel in gratitude to G'd.