כֹּ֤ה אָמַר֙ אֲדֹנָ֣י יְהוִ֔ה גֵּ֤ה גְבוּל֙ אֲשֶׁ֣ר תִּתְנַחֲל֣וּ אֶת־הָאָ֔רֶץ לִשְׁנֵ֥י עָשָׂ֖ר שִׁבְטֵ֣י יִשְׂרָאֵ֑ל יוֹסֵ֖ף חֲבָלִֽים׃
Thus saith the Lord GOD: ‘This shall be the border, whereby ye shall divide the land for inheritance according to the twelve tribes of Israel, Joseph receiving two portions.
Read kabbalistic (mystical) interpretation of Ezekiel 47:13: and classical mystical sources.