וַֽיַּעֲשׂוּ֮ שְׁתֵּ֣י טַבְּעֹ֣ת זָהָב֒ וַֽיִּתְּנֻ֡ם עַל־שְׁתֵּי֩ כִתְפֹ֨ת הָאֵפֹ֤ד מִלְמַ֙טָּה֙ מִמּ֣וּל פָּנָ֔יו לְעֻמַּ֖ת מֶחְבַּרְתּ֑וֹ מִמַּ֕עַל לְחֵ֖שֶׁב הָאֵפֹֽד׃
And they made two rings of gold, and put them on the two shoulder-pieces of the ephod underneath, in the forepart thereof, close by the coupling thereof, above the skilfully woven band of the ephod.
Read midrashic interpretation of Exodus 39:20: and classical rabbinic exegesis.