וְהַעֲבַרְתִּ֥י אֶתְכֶ֖ם תַּ֣חַת הַשָּׁ֑בֶט וְהֵבֵאתִ֥י אֶתְכֶ֖ם בְּמָסֹ֥רֶת הַבְּרִֽית׃
And I will cause you to pass under the rod, and I will bring you into the bond of the covenant;
Read kabbalistic (mystical) interpretation of Ezekiel 20:37: and classical mystical sources.