Joshua 18:4-6

4Provide you three men for a tribe; that I may send them, and they shall rise and go through the land, and describe it according to the proportion of their inheritance, and they shall come to me.

5And they shall divide it into seven portions. Judah shall remain in their border on the south, and the house of Joseph shall remain in their border on the north;

6and ye shall describe the land into seven portions, and bring [the description] hither to me, and I will cast lots for you here before Jehovah our 1God.