Psalms 118:3

Let the house of Aaron now say, that his mercy [endureth] for ever. The priests and Levites that blessed the people, and taught them the knowledge of divine things; but not these literally, at least not only these, since the priesthood of Aaron is changed, and the law of it abrogated, and all believers are now priests unto God, and offer up spiritual sacrifices to him; and particularly the sacrifice of praise for his grace and mercy, the perpetuity of which they should publish and proclaim all abroad.