Exodus 26:32,37
And you shall hang it on four pillars of shittim wood overlaid with gold: their hooks shall be of gold, on the four sockets of silver.
Nave's Topical Index—AKJV

Exodus 36:36
And he made thereunto four pillars of shittim wood, and overlaid them with gold: their hooks were of gold; and he cast for them four sockets of silver.
Nave's Topical Index—AKJV