And thou shalt make boards for the tabernacle of shittim wood standing up.

Wesley's Notes

26:15 Very particular directions are here given about the boards of the tabernacle, which were to bear up the curtains. These had tenons which fell into the mortaises that were made for them in silver bases. The boards were coupled together with gold rings at top and bottom, and kept firm with bars that run through golden staples in every board. Thus every thing in the tabernacle was very splendid, agreeable to that infant state of the church, when such things were proper to possess the minds of the worshippers with a reverence of the divine glory. In allusion to this, the new Jerusalem is said to be of pure gold, Rev 21:18. But the builders of the gospel church said, Silver and gold have we none; and yet the glory of their building far exceeded that of the tabernacle.

Scofield Reference Notes

[1] boards

The typical meaning of the boards is clear as to Christ. Acacia wood, a desert growth, is a fitting symbol of Christ in His humanity as "a root out of dry ground" Isa 53:2. The covering, gold, typifies Deity in manifestation, speaks of His divine glory. As applied to the individual believer the meaning of the boards is less clear. The connection may be found in Jn 17:21,22,23 Eph 1:4,6 1Jn 4:13. Only as seen "in Him" could the boards be taken as representing the believer. So viewed the type is beautiful. In the world, and yet separated from it by the silver of redemption Gal 1:4 Ex 30:11-16 38:25-27 as the boards of the tabernacle were separated from the earth by the sockets of silver, and united by the "middle bar" Ex 26:28 representing both the one life Gal 2:20 and one Spirit Eph 4:3 "all the building, fitly framed together, groweth unto an holy temple in the Lord." Eph 2:21.

Jamieson-Fausset-Brown Bible Commentary

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.

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.