TT #19 · Parshas Shemini · Aliyah 2 · Passuk 17
Chabad.org — English translation + Rashi
Sifra (Toras Kohanim), Shemini, Mekhilta de-Miluim II 11.
Sefaria — Sifra, Shemini, Mekhilta DeMiluim II 11
English: “He filled his hand.” A similar expression of filling is used below, “his full handful.” Just as there, if a clod, a grain of salt, or a particle of frankincense rose in his handful, the offering is invalid, so here as well.
Gezeirah shavah / verbal comparison — the repeated expression of “filling” links this act with the handful taken in the meal offering and transfers its halachic rule.
The phrase וַיְמַלֵּא כַפּוֹ teaches that the priestly handful here is governed by the same standard as the מְלֹא קֻמְצוֹ of a meal offering: an unintended foreign substance caught in the handful invalidates the act.