וְאֵ֙לֶּה֙ מוֹשְׁבוֹתָ֔ם לְטִירוֹתָ֖ם בִּגְבוּלָ֑ם לִבְנֵ֤י אַהֲרֹן֙ לְמִשְׁפַּחַ֣ת הַקְּהָתִ֔י כִּ֥י לָהֶ֖ם הָיָ֥ה הַגּוֹרָֽל׃
Now these are their dwelling-places according to their encampments in their borders: to the sons of Aaron, of the families of the Kohathites, for theirs was the [first] lot,
Read kabbalistic (mystical) interpretation of I Chronicles 6:39: and classical mystical sources.