Ibn Ezra on Leviticus 6:21

תבשל בו. גם בשלה ומורק ושוטף מבנין שלא נקרא שם פועלו ובא ומורק בחול״ם בעבור הרי״ש שלא תדגש כי אם במקומות מועטים במשקל לא זורק עליו מגזרת מרקו הרמחים כי המ״ם שרש: WHEREIN IT IS SODDEN. Bushalah (sodden), morak (scoured), and shuttaf (rinsed) are all pu’als. Morak is vocalized with a cholam⁷⁰Rather than with a kubbutz, as is the case in the pu’al. because of the resh which, except in a few places,⁷¹The massorah records seven instances in Scripture when a dagesh is placed in the resh (Krinsky). does not receive a dagesh.⁷²A dagesh is placed in the middle root letter in the pu’al. However, the resh does not receive a dagesh. Hence the vowel changes from a kubbutz to a cholam. Morak follows the paradigm of zorak (dashed)⁷³A pu’al. in was not dashed against him (Num. 19:13). Morak is related to the word mirku (furbish) in Furbish the spears (Jer. 46:4), for the mem of morak is a root letter.