Verses Lv09-01:02 describing the Priestly inauguration offering states And he said to Aaron, Take a one year old calf for a sin offering, and a ram for a burnt offering, without blemish, and offer them before the Lord. Rashi Lv09-07d explains that As the underlined words indicate the word calf generally means an ox of age 1 (strictly under 2).

Advanced Rashi: The astute reader will recognize this Rashi as one of the famous hermeunetical rules of Rabbi Ishmael: If some class [e.g. the class of calfs] has an anomaly [e.g. one verse speaks about one-year calfs] then that anomaly [e.g. the fact that calfs must be one year old] applies to the whole class [e.g. all calfs must be one year] and not only to that case [e.g. in other words it is not just the priest-inaugral calf that must be one year but all calfs generally must be one year].

I have in my Rashi classes explained this Rabbi Ishmael principle more thoroughly as follows:
1. We all know the heuristic that calfs are young oxen
2. However we don't know how young
3. So if the above two criteria are met
   • We have a general idea
   • but we don't have details
   then we may generalize a specific verse to all cases assuming there are no verses contradicting our generalization.

Note the Davka translation renders the above verse young calf thereby avoiding the literal Biblical text which states one year old calf. We see here the superiority of the Hebrew text as understood by Rashi over even a good English translations.