וְאַתָּ֣ה וּבָנֶ֣יךָ אִ֠תְּךָ תִּשְׁמְר֨וּ אֶת־כְּהֻנַּתְכֶ֜ם לְכָל־דְּבַ֧ר הַמִּזְבֵּ֛חַ וּלְמִבֵּ֥ית לַפָּרֹ֖כֶת וַעֲבַדְתֶּ֑ם עֲבֹדַ֣ת מַתָּנָ֗ה אֶתֵּן֙ אֶת־כְּהֻנַּתְכֶ֔ם וְהַזָּ֥ר הַקָּרֵ֖ב יוּמָֽת׃ (ס)
Mas tú y tus hijos contigo guardaréis vuestro sacerdocio en todo negocio del altar, y del velo adentro, y ministraréis. Yo os he dado en don el servicio de vuestro sacerdocio; y el extraño que se llegare, morirá.
Tosefta Chagigah (Lieberman)
3:19: R. Neḥemiah asks why everyone is trusted in matters related to purification-water and Holy Things, but not in matters of heave-offering. He suggests it's to prevent individuals from assuming roles restricted for the priesthood, citing Numbers 18:7. He questions whether this restriction extends to heave-offering, heave-offering of tithe, and dough-offering, but concludes these are excluded because they are subject to the knowledge and consent of the Israelites, unlike tasks within the veil.