וְֽאֶת־הַקְּרָשִׁ֞ים צִפָּ֣ה זָהָ֗ב וְאֶת־טַבְּעֹתָם֙ עָשָׂ֣ה זָהָ֔ב בָּתִּ֖ים לַבְּרִיחִ֑ם וַיְצַ֥ף אֶת־הַבְּרִיחִ֖ם זָהָֽב׃
And he overlaid the boards with gold, and made their rings of gold for holders for the bars, and overlaid the bars with gold.
Read kabbalistic (mystical) interpretation of Exodus 36:34: and classical mystical sources.