You are also to make five crossbars of acacia wood for the frames on one side of the tabernacle,
Very particular directions are here given about the boards of the tabernacle, which were to bear up the curtains, as the stakes of a tent which had need to be strong, Isa 54:2. These boards had tenons which fell into the mortises that were made for them in silver bases. God took care to have every thing strong, as well as fine, in his tabernacle.
Commenting on Exodus 26:15-30
And the middle bar in the midst of the boards shall reach from end to end. From east to west, as Jarchi interprets it; but this can only be said of the middle bar on the north and south sides of the tabernacle, for the middle bar at the west end was north to south: about this bar there is some difficulty, as that it...
Exo 26:25-27 Sixteen sockets were to be made for these eight boards, two for each. - Exo 26:26-29. To fasten the boards, that they might not separate from one another, bars of acacia-wood were to be made and covered with gold, five for each of the three sides of the dwelling; and though it is not expressly stated, yet the reference to rings in Exo...
Commenting on Exodus 26:25-27