וַיָּ֥מָד קִֽיר־הַבַּ֖יִת שֵׁ֣שׁ אַמּ֑וֹת וְרֹ֣חַב הַצֵּלָע֩ אַרְבַּ֨ע אַמּ֜וֹת סָבִ֧יב ׀ סָבִ֛יב לַבַּ֖יִת סָבִֽיב׃
Dann maß er die Wand des Hauses, sechs Ellen; und die Breite jeder Seitenkammer, vier Ellen, um das Haus herum auf jeder Seite.
Rashi on Ezekiel
and the width of the cell [Heb. הַצֵלָע,] apendiz in Old French. The interior of the cell behind it was four amos in measurement, and in the Second Temple it was six (amos). And perforce this Temple is the one of the future, because there was no wall separating the Holy of Holies in the Second Temple.