|Matthew Henry's Concise Commentary|
26:15-30 The sockets of silver each weighed about 115 pounds; they were placed in rows on the ground. In every pair of these sockets, a strong board of shittim-wood, covered with plates of gold, was fitted by mortises and tenons. Thus walls were formed for the two sides, and for the west end. The wall was further held together by bars, which passed through rings of gold. Over this the curtains were spread. Though movable, it was strong and firm. The materials were very costly. In all this it was a type of the church of God, built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief Corner-stone, Eph 2:20,21.
Verses 22, 23. - For the sides of the tabernacle westward. Rather, "for the back" (τὰ ὀπίσω - LXX.). Here there were to be six boards only, which would give the abnormal and improbable width of nine cubits. The additional cubit required was no doubt obtained from the corner boards, or posts, each of which added to the (internal) width half a cubit (see ver. 23).
Gill's Exposition of the Entire Bible
And for the sides of the tabernacle,.... Or the ends of it, the east and west, and the account begins with the west:
westward thou shalt make six boards; so that the breadth of the tabernacle was but nine cubits, or four yards and a half, according to a common cubit; but two boards more placed at the two corners of the sides, next observed, added to the breadth of it.
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