Keluaran 28:12

28:12 You are to put the two stones on the shoulders of the ephod, stones of memorial for the sons of Israel, and Aaron will bear their names before the Lord on his two shoulders for a memorial. ¹ 

Keluaran 28:19

28:19 and the third row, a jacinth, an agate, and an amethyst;

[28:12]  ¹ sn This was to be a perpetual reminder that the priest ministers on behalf of the twelve tribes of Israel. Their names would always be borne by the priests.