Numbers 13:11 - Matthew Poole's English Annotations on the Holy Bible

i.e. Of that part of the tribe of Joseph which is peculiarly called the tribe of Manasseh, as the other part of it was called the tribe of Ephraim, Numbers 13:8. The name of Joseph is elsewhere appropriated to Ephraim, as Ezekiel 37:16,19 Re 7:8; here to Manasseh; possibly to aggravate the sin of the ruler of this tribe, who did so basely degenerate from his noble ancestor, Joseph.