Reference for Exodus 39:4

כְּתֵפֹ֥ת עָֽשׂוּ־ל֖וֹ חֹבְרֹ֑ת עַל־שְׁנֵ֥י קצוותו [קְצוֹתָ֖יו] חֻבָּֽר׃

They made shoulder-pieces for it, joined together; at the two ends was it joined together.