הִשָּׁ֣מֶר לְךָ֔ פֶּֽן־תַּעֲזֹ֖ב אֶת־הַלֵּוִ֑י כָּל־יָמֶ֖יךָ עַל־אַדְמָתֶֽךָ׃ (ס)
Take heed to thyself that thou forsake not the Levite as long as thou livest upon thy land.
Read kabbalistic (mystical) interpretation of Deuteronomy 12:19: and classical mystical sources.