Ibn Ezra on Leviticus 18:24

אל תטמאו. דגשות הטי״ת להתבלע תי״ו התפעל ולא נו״ן בנין נפעל והעד דגשות הטי״ת להתבלע תי״ו התפעל ולא נו״ן בנין נפעל והעד דגשות המ״ם כמשפט והנה הזכיר כל כלם שהם מטמאים הנפש: DEFILE NOT YE YOURSELVES. The tet of tittamme’u (defile ye yourselves) has a dagesh to compensate for the swallowed¹¹⁸Missing. tav of the hitpa’el.¹¹⁹Tittamme’u is a hitpa’el. The dagesh does not compensate for the nun of the nifal.¹²⁰In other words, tittamme’u is not a nifal imperfect. The dagesh in the mem of tittamme’u, which is there according to the rules of grammar, is proof of this.¹²¹A dagesh is not placed in the middle root letter in the nifal imperfect It is in the hitpa’el. Observe, Scripture notes that each one of these acts defiles the soul.

משלח מפניכם. טעמו מהארץ הטהורה מתים או מגורשים: WHICH I CAST OUT FROM BEFORE YOU. It means, from the Holy Land, dead or expelled.¹²²The nations of Canaan either were killed or fled from the land.