Exodus 27:20

All the pillars of the court around shall be filleted with silver; their hooks of silver, and their sockets of bronze.

The length of the court shall be one hundred cubits, and the width fifty throughout, and the height five cubits, of fine twined linen, and their sockets of bronze.

All the instruments of the tabernacle in all its service, and all its pins, and all the pins of the court, shall be of bronze.

In the Tent of Meeting, outside the veil which is before the covenant, Aaron and his sons shall keep it in order from evening to morning before the LORD: it shall be a statute forever throughout their generations on the behalf of the children of Israel.