Exodus 28:7 Kabbalah

שְׁתֵּ֧י כְתֵפֹ֣ת חֹֽבְרֹ֗ת יִֽהְיֶה־לּ֛וֹ אֶל־שְׁנֵ֥י קְצוֹתָ֖יו וְחֻבָּֽר׃

It shall have two shoulder-pieces joined to the two ends thereof, that it may be joined together.

Read kabbalistic (mystical) interpretation of Exodus 28:7: and classical mystical sources.