הַקָּהָ֕ל חֻקָּ֥ה אַחַ֛ת לָכֶ֖ם וְלַגֵּ֣ר הַגָּ֑ר חֻקַּ֤ת עוֹלָם֙ לְדֹרֹ֣תֵיכֶ֔ם כָּכֶ֛ם כַּגֵּ֥ר יִהְיֶ֖ה לִפְנֵ֥י יְהוָֽה׃
As for the congregation, there shall be one statute both for you, and for the stranger that sojourneth with you, a statute for ever throughout your generations; as ye are, so shall the stranger be before the LORD.
Read kabbalistic (mystical) interpretation of Numbers 15:15: and classical mystical sources.