Parashas Vaeira · Side page (no TT primary unit)
וְאֵ֨לֶּה שְׁמ֤וֹת בְּנֵֽי־לֵוִי֙ לְתֹ֣לְדֹתָ֔ם גֵּרְשׁ֕וֹן וּקְהָ֖ת וּמְרָרִ֑י וּשְׁנֵי֙ חַיֵּ֣י לֵוִ֔י שֶׁ֧בַע וּשְׁלֹשִׁ֛ים וּמְאַ֖ת שָׁנָֽה׃
These are the names of Levi’s sons by their lineage: Gershon, Kohath, and Merari; and the span of Levi’s life was 137 years.
Shemos Rabbah 6:3 / Seder Olam parallels — EXTRA.
שני חיי לוי —\ldots למנות את שנות השעבוד.
English: “The years of the life of Levi” — \ldots to count the years of the oppression.
Custom
Chazal use Levi’s years as a chronological anchor for the length of the bondage.