וַיַּ֤רְא יוֹסֵף֙ לְאֶפְרַ֔יִם בְּנֵ֖י שִׁלֵּשִׁ֑ים גַּ֗ם בְּנֵ֤י מָכִיר֙ בֶּן־מְנַשֶּׁ֔ה יֻלְּד֖וּ עַל־בִּרְכֵּ֥י יוֹסֵֽף׃
And Joseph saw Ephraim’s children of the third generation; the children also of Machir the son of Manasseh were born upon Joseph’s knees.
Read midrashic interpretation of Genesis 50:23: and classical rabbinic exegesis.