EXPOSITORY (ENGLISH BIBLE)
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.
In the two sides - Rather, at the back.
15-30. thou shalt make boards … rear up the tabernacle according to the fashion … which was showed thee—The tabernacle, from its name as well as from its general appearance and arrangements, was a tent; but from the description given in these verses, the boards that formed its walls, the five (cross) bars that strengthened them, and the middle bar that "reached from end to end," and gave it solidity and compactness, it was evidently a more substantial fabric than a light and fragile tent, probably on account of the weight of its various coverings as well as for the protection of its precious furniture.
Which were of another fashion than the former, as may be gathered both from the distinct nomination and use of them, and from the laws of building. And whereas the rest were but single boards, these were double, for greater strength and conveniency of joining them together.
And two boards shalt thou make for the corners of the tabernacle in the two sides. For the northwest and southwest corners, in the north and south sides; concerning which Dr. Lightfoot thus writes (t): and the west end had six planks entire, besides a plank at either corner, joining end and sides together; these corner planks were of the same breadth that all the others were, and, thus set, the middle of the breadth of the one plank was laid close to the end of the south side, or to that plank that was furthest west; so that a quarter of a yard of the breadth of the corner plank was inward, to make up the tabernacle breadth, a quarter was taken up with the thickness of the side plank to which it joined, and a quarter lay outward: thus at the southwest, just so was it at the northwest corner: then count; the two corner planks were inward a quarter of a yard apiece, and the six planks that stood between them of three quarters apiece, behold five yards, just the breadth of the house between wall and wall: these corners knit end and side together, and were the strength of the building; as, adds he,"Christ is of his church, making Jews and Gentiles one spiritual temple.''
(t) Ut supra. (Works, vol 1. p. 719.) And two boards shalt thou make for the corners of the tabernacle in the two sides.