כֹּֽה־אָמַ֤ר יְהוָה֙ אֵלַ֔י עֲשֵׂ֣ה לְךָ֔ מוֹסֵר֖וֹת וּמֹט֑וֹת וּנְתַתָּ֖ם עַל־צַוָּארֶֽךָ׃
’Thus saith the LORD to me: Make thee bands and bars, and put them upon thy neck;
Read kabbalistic (mystical) interpretation of Jeremiah 27:2: and classical mystical sources.