pesachim 62

if a book is so hard to study - the lost book - where a word can contain 400 camels of meaning and interpretation. that even the wisest of women would take over 3 years to study...
is the problem with the book or the student

the sacrifice or the people

(when discussing invalid sacrifices, a story of a student who wants to take 3 months to study the Book of Generations, a lost book that contain many intepretations. and like all lost books has mythic number of meanings and richness. this student was told that even Bruia took over 3 years and couldn't complete this. the discussion about invalid sacrifices is if the problem was with the animal or the people offering the animal.)