והיתה לו ולזרעו אחריו ברית כהנת עולם תחת אשר קנא לאלקיו ויכפר על בני ישראל
Pinchas was inducted into the Kehunah, Priesthood, following his zealous act of killing Zimri, the Nasi, Prince, of the Tribe of Shimon. Rashi explains that, until this point in time, the only Kohanim were Aharon HaKohen, his sons and future offspring. Since Pinchas was not a son (neither were his future offspring), he was not included in the Kehunah. In one of the teachings of the Zohar, the position is taken that by killing Zimri, Pinchas became forever disqualified from the Kehunah. Thus, the Kehunah, which he received as a reward, was a totally new Kehunah, not connected with that…