Exodus 39:15 Midrash

וַיַּעֲשׂ֧וּ עַל־הַחֹ֛שֶׁן שַׁרְשְׁרֹ֥ת גַּבְלֻ֖ת מַעֲשֵׂ֣ה עֲבֹ֑ת זָהָ֖ב טָהֽוֹר׃

And they made upon the breastplate plaited chains, of wreathen work of pure gold.

Read midrashic interpretation of Exodus 39:15: and classical rabbinic exegesis.