Rashi on Leviticus 15:31/רש"י על ויקרא ט״ו:ל״א

1והזרתם THUS SHALL YE PUT APART [THE CHILDREN OF ISRAEL] — The word נזר has wherever it occurs the meaning of "separating". Similar is (Isaiah 1:4) “they are gone away (נזורו) backward" ; (Genesis 49:26) “him that was separated from (נזיר) his brethren” (Sifra, Metzora Parashat Zavim, Chapter 9 6).

2ולא ימתו בטמאתם THAT THEY DIE NOT IN THEIR UNCLEANNESS [WHEN THEY DEFILE MY TABERNACLE] — Thus you see that the penalty of “excision” to which one who defiles the Holy Place is subject (cf. Numbers 19:13) is here called מיתה (i. e. מיתה בידי שמים) (cf. Sifrei Bamidbar 125).