בְּלֶכְתָּ֗ם אֶל־אַרְבַּ֤עַת רִבְעֵיהֶם֙ יֵלֵ֔כוּ לֹ֥א יִסַּ֖בּוּ בְּלֶכְתָּ֑ם כִּ֣י הַמָּק֞וֹם אֲשֶׁר־יִפְנֶ֤ה הָרֹאשׁ֙ אַחֲרָ֣יו יֵלֵ֔כוּ לֹ֥א יִסַּ֖בּוּ בְּלֶכְתָּֽם׃
Kapag sila'y lumalakad, lumalakad sila patungo sa alinman sa kanilang apat na panig; hindi sila pumipihit habang sila'y lumalakad, sapagkat saanmang dako humarap ang ulo, sinusundan nila ito; hindi sila pumipihit habang sila'y lumalakad.
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)