Exodus 27:16-17

16 ¶ And for the gate of the court shall be an hanging of twenty cubits, of blue, and purple, and scarlet, and fine twined linen, wrought with needlework: and their pillars shall be four, and their sockets four. 17 All the pillars round about the court shall be filleted with silver; their hooks shall be of silver, and their sockets of brass.