וְהֶעָרִ֖ים אֲשֶׁ֣ר תִּתֵּ֑נוּ שֵׁשׁ־עָרֵ֥י מִקְלָ֖ט תִּהְיֶ֥ינָה לָכֶֽם׃
And as to the cities which ye shall give, there shall be for you six cities of refuge.
Read kabbalistic (mystical) interpretation of Numbers 35:13: and classical mystical sources.