Page 653 - BERESHIT

Why did Menashe and Ephraim receive a portion in the Land of Israel and
be counted amongst the Shevatim?

Menashe and Ephraim grew up in Egypt, which was known for its
depravity and immorality. Yet, they remained righteous and markedly
different from their gentile neighbors. They kept their Jewish identity and
cleaved to the Torah.

Additionally, Yaakov knew that the tribe of Levi would not receive a
portion in the land.

Yaakov blessed Menashe and Ephraim that they should be like Reuven
and Shimon. Reuven was the first issue of Yaakov, and the emergence of
the children of Yosef as Shevatim was no less important in his eyes.
Yaakov also prayed that his decision be blessed from Above.