וּשְׁתֵּי֩ טַבְּעֹ֨ת זָהָ֜ב תַּֽעֲשֶׂה־לּ֣וֹ ׀ מִתַּ֣חַת לְזֵר֗וֹ עַ֚ל שְׁתֵּ֣י צַלְעֹתָ֔יו תַּעֲשֶׂ֖ה עַל־שְׁנֵ֣י צִדָּ֑יו וְהָיָה֙ לְבָתִּ֣ים לְבַדִּ֔ים לָשֵׂ֥את אֹת֖וֹ בָּהֵֽמָּה׃
And two golden rings shalt thou make for it under the crown thereof, upon the two ribs thereof, upon the two sides of it shalt thou make them; and they shall be for places for staves wherewith to bear it.
Read kabbalistic (mystical) interpretation of Exodus 30:4: and classical mystical sources.