Ibn Ezra on Numbers 15:29

תורה אחת. כזאת תורת החטאת: ONE LAW.⁴⁵Hebrew, torah achat. This is similar to This is the law of (torat) the sin-offering (Lev. 6:18).⁴⁶The word torah (law) (rather than mitzvat, chukkat, mishpat) is used with regard to the rules of the sacrifices (Filwarg).