בְּלֶכְתָּ֗ם אֶל־אַרְבַּ֤עַת רִבְעֵיהֶם֙ יֵלֵ֔כוּ לֹ֥א יִסַּ֖בּוּ בְּלֶכְתָּ֑ם כִּ֣י הַמָּק֞וֹם אֲשֶׁר־יִפְנֶ֤ה הָרֹאשׁ֙ אַחֲרָ֣יו יֵלֵ֔כוּ לֹ֥א יִסַּ֖בּוּ בְּלֶכְתָּֽם׃
Dans leur marche, elles allaient dans leurs quatre directions, sans se détourner dans leur marche, car là où se dirigeait la tête, elles marchaient à sa suite sans se détourner dans leur marche.
Siftei Chakhamim
And then it says: “He ran to greet them.” Some ask: According to the Aggadah that they were close and then moved away, it should say: “He ran after them”! The answer is: Avraham’s tent had four openings. When they went away, he ran from that opening to one in the north or south, to stop them [from leaving]. That is why it says, “[He ran toward them] to greet them.” Another answer is: Angels have no backside, [but multiple faces]. For it says (Yechezkel 1:12): “They did not turn as they walked.” Although these angels were in the guise of men, they retained their trait of seeing what was either in front or behind them. [Thus, Avraham was actually greeting their faces.] (Toldos Yitzchok)