Deuteronomy 33:17

17 May the firstborn of his bull bring him honor,
and may his horns be those of a wild ox;
with them may he gore all peoples,
all the far reaches of the earth.
They are the ten thousands of Ephraim,
Ephraim and Manasseh were the sons of Joseph who became founders of the two tribes into which Joseph’s descendants were split (Gen 48:19–20). Jacob’s blessing granted favored status to Ephraim; this is probably why Ephraim is viewed here as more numerous than Manasseh.

and they are the thousands of Manasseh.
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