וַיְגָ֖רֶשׁ אֶת־הָֽאָדָ֑ם וַיַּשְׁכֵּן֩ מִקֶּ֨דֶם לְגַן־עֵ֜דֶן אֶת־הַכְּרֻבִ֗ים וְאֵ֨ת לַ֤הַט הַחֶ֙רֶב֙ הַמִּתְהַפֶּ֔כֶת לִשְׁמֹ֕ר אֶת־דֶּ֖רֶךְ עֵ֥ץ הַֽחַיִּֽים׃ (ס)
און ער האָט אַרױסגעטריבן דעם מענטשן; און ער האָט אַרײַנגעזעצט אין מזרח פֿון דעם גאָרטן פֿון עֵדֶן די כּרובים, און די פֿלאַמיקע שװערד װאָס דרײט זיך, צו היטן דעם װעג צום בױם פֿון לעבן.
Rashi
מקדם לגן עדן AT THE EAST OF THE GARDEN OF EDEN — Not in the eastern part of the Garden but eastward of the garden of Eden and outside the garden.
Chizkuni
ויגרש את האדם; “as soon as He had expelled Adam, etc.;” this verse does not mean to tell us that G-d had expelled Adam and his family, as we have already been told this in the previous verse. We have to understand this verse as follows: “as soon as G-d had expelled Adam and his wife, G-d positioned angels at the entrance to Gan Eden.
Da'at Zekenim
להט, “flaming;” ,the expression “flaming sword,” is a metaphor describing hell which is presumed as a domain in which freezing cold and burning heat constantly alternately, inflicting indescribable discomfort on its wicked inhabitants.