Exodus 28:22 Midrash

וְעָשִׂ֧יתָ עַל־הַחֹ֛שֶׁן שַֽׁרְשֹׁ֥ת גַּבְלֻ֖ת מַעֲשֵׂ֣ה עֲבֹ֑ת זָהָ֖ב טָהֽוֹר׃

And thou shalt make upon the breastplate plaited chains of wreathen work of pure gold.

Read midrashic interpretation of Exodus 28:22: and classical rabbinic exegesis.