וְנָשָׂ֣א אַ֠הֲרֹן אֶת־שְׁמ֨וֹת בְּנֵֽי־יִשְׂרָאֵ֜ל בְּחֹ֧שֶׁן הַמִּשְׁפָּ֛ט עַל־לִבּ֖וֹ בְּבֹא֣וֹ אֶל־הַקֹּ֑דֶשׁ לְזִכָּרֹ֥ן לִפְנֵֽי־יְהוָ֖ה תָּמִֽיד׃
And Aaron shall bear the names of the children of Israel in the breastplate of judgment upon his heart, when he goeth in unto the holy place, for a memorial before the LORD continually. .
Read kabbalistic (mystical) interpretation of Exodus 28:29: and classical mystical sources.