Exodus 36:27 Midrash

וּֽלְיַרְכְּתֵ֥י הַמִּשְׁכָּ֖ן יָ֑מָּה עָשָׂ֖ה שִׁשָּׁ֥ה קְרָשִֽׁים׃

And for the hinder part of the tabernacle westward he made six boards.

Read midrashic interpretation of Exodus 36:27: and classical rabbinic exegesis.