וּכְפִתְחֵ֣י הַלְּשָׁכ֗וֹת אֲשֶׁר֙ דֶּ֣רֶךְ הַדָּר֔וֹם פֶּ֖תַח בְּרֹ֣אשׁ דָּ֑רֶךְ דֶּ֗רֶךְ בִּפְנֵי֙ הַגְּדֶ֣רֶת הֲגִינָ֔ה דֶּ֥רֶךְ הַקָּדִ֖ים בְּבוֹאָֽן׃
so were also the doors of the chambers that were toward the south, there was a door in the head of the way, even the way directly before the wall, toward the way from the east, as one entereth into them.
Read midrashic interpretation of Ezekiel 42:12: and classical rabbinic exegesis.