Joshua 14:4
For the children of Joseph were two tribes, Manasseh and Ephraim: therefore they gave no part unto the Levites in the land, save cities to dwell in, with their suburbs for their cattle and for their substance.
Cross-references
Joshua 21:2-42 lists the actual cities given to Levites – the detailed fulfillment of the second part of this verse.
Joshua 13:14 states Levi received no land inheritance, only the Lord's offerings – directly reinforces the Levites' lack of tribal territory.
Genesis 48:5 shows Jacob adopting Ephraim and Manasseh as his own sons, making them two tribes – the basis for Joseph's double portion.
Numbers 35:2-8 gives the original command for Levitical cities – the law behind the practice described here.
1 Chronicles 5:1 explains Joseph received the birthright after Reuben's sin, resulting in two tribes – the reason for Joseph's two tribes.
1 Chronicles 5:2 reiterates that the birthright was Joseph's, leading to two tribes – same reason as previous.
1 Chronicles 6:54-81 provides another record of Levitical cities – parallel account to Joshua 21.
Deuteronomy 12:12 explains Levites have no inheritance, which is why they received only cities – the rationale for Levitical cities.
Genesis 48:6 specifies that Joseph's later children are counted under Ephraim or Manasseh – limiting the two tribes.