ולבני קהת לא נתן כי עבודת הקודש עליהם בכתף ישאו
The Chida, zl, offers a compelling interpretation of this pasuk. Shevet Kehas, the Tribe of Kehas, was part of Shevet Levi, the tribe which represents the lomdei Torah, those who devote themselves to the study of Torah. As such, says the Chida, the chiyuv, obligation, to study Torah is never-ending. It is a ceaseless commitment on the part of the devoted to learn Torah literally until his last ounce of strength, until his very last breath. One cannot retire from Torah. One whose vocation is teaching Torah will, upon retirement, move on to studying Torah full time. This idea is…