Exodus 26:27 Kabbalah

וַחֲמִשָּׁ֣ה בְרִיחִ֔ם לְקַרְשֵׁ֥י צֶֽלַע־הַמִּשְׁכָּ֖ן הַשֵּׁנִ֑ית וַחֲמִשָּׁ֣ה בְרִיחִ֗ם לְקַרְשֵׁי֙ צֶ֣לַע הַמִּשְׁכָּ֔ן לַיַּרְכָתַ֖יִם יָֽמָּה׃

and five bars for the boards of the other side of the tabernacle, and five bars for the boards of the side of the tabernacle, for the hinder part westward;

Read kabbalistic (mystical) interpretation of Exodus 26:27: and classical mystical sources.