쉐모트 (출애굽기) 6:16

ושני חיי לוי וגו׳ AND THE YEARS OF THE LIFE OF LEVI WERE etc. — Why is the number of the years of Levi mentioned? In order to tell us how long the period of slavery lasted — because so long as even one of the sons of Jacob (lit. the tribes) remained alive there was no slavery imposed upon the Israelites, as it is said, (Exodus 1:6) “And Joseph died and all his brethren”, and afterwards it is stated (Exodus 1:8), “Now there arose a king” (who enslaved them); and Levi lived the longest of all of them (Seder Olam 3).

וְאֵ֨לֶּה שְׁמ֤וֹת בְּנֵֽי־לֵוִי֙ לְתֹ֣לְדֹתָ֔ם גֵּרְשׁ֕וֹן וּקְהָ֖ת וּמְרָרִ֑י וּשְׁנֵי֙ חַיֵּ֣י לֵוִ֔י שֶׁ֧בַע וּשְׁלֹשִׁ֛ים וּמְאַ֖ת שָׁנָֽה׃

And these are the names of the sons of Levi, by generations, Gershon, and Qehat, and Merari: and the years of Levi’s life were a hundred and thirty seven years.