Numbers 1:32-33

1:32 From the sons of Joseph:

From the descendants of Ephraim: According to the records of their clans and families, all the males twenty years old or older who could serve in the army were listed by name. 1:33 Those of them who were numbered from the tribe of Ephraim were 40,500.

Numbers 2:18-19

The Tribes on the West

2:18 “On the west will be the divisions of the camp of Ephraim under their standard. The leader of the people of Ephraim is Elishama son of Amihud. 2:19 Those numbered in his division are 40,500.