Exodus 27:13-16

The width of the court [to the front], on the east side shall be fifty cubits. The curtains for one side [of the gate] shall be fifteen cubits with three pillars and three sockets. On the other side [of the gate] the curtains shall be fifteen cubits with three pillars and three sockets. For the gate of the court there shall be a screen [to provide a covering] of twenty cubits, of blue, purple, and scarlet fabric and finely woven [embroidered] linen, the work of an embroiderer, with four pillars and four [base] sockets.