Four pillars. The contrast between these four pillars of the interior, and the "five pillars" at "the door of the tent" (Exodus 26:36, Exodus 26:37), is striking, and justifies the supposition that the veil in the tabernacle did not completely divide the holy of holies from the holy place, but formed a screen, above which the space was open.
If the veil had been hung from the top of the tented roof, so as completely to separate the two places, there must have been fire pillars, or at any rate an odd number, m the interior. Their hooks shall be of gold.
These are hooks attached to the pillars, for the purpose of their having the curtains hung upon them. Upon the four sockets. The word "sockets" has no article. Translate—"Thou shalt hang it upon four pillars of shittim wood overlaid with gold, with their hooks of gold, and standing upon four sockets of silver.
The pillars probably had "tenons," like the boards (Exodus 26:17), which were inserted into silver sockets, let into the ground.