Exodus 1:5

ויוסף היה במצרים lit., AND JOSEPH WAS IN EGYPT — But were not he and his sons included in the seventy? What, then, is this statement intended to tell us? Do we not know that he was in Egypt? But its purpose is to inform you of Joseph’s righteousness: this is the same Joseph who tended his father’s sheep; this is the same Joseph who was in Egypt and became king there, and yet he remained steadfast in his righteousness, and the change from a humble position to exalted rank in Egypt caused no deterioration in his character (cf. Sifrei האזינו; Exodus Rabbah 1:7).

וַֽיְהִ֗י כׇּל־נֶ֛פֶשׁ יֹצְאֵ֥י יֶֽרֶךְ־יַעֲקֹ֖ב שִׁבְעִ֣ים נָ֑פֶשׁ וְיוֹסֵ֖ף הָיָ֥ה בְמִצְרָֽיִם׃

And all the souls that came out of the loins of Ya῾aqov were seventy souls: for Yosef was already in Miżrayim.