Let the house of Aaron now say - Compare Psalm 115:10. The ministers of religion. They are appointed to serve God; to lead in his worship; to defend his truth; to keep up faith in the truth of religion. They are, therefore, interested in my case, and may derive from it a new proof of the merciful character of God which they may employ, not only for their own encouragement in personal piety, but in the duties of their office. My case furnishes a new argument, of which they can make use in defending the truth, and in illustrating the power of religion.

The house of Aaron - The priesthood is still preserved, and the temple worship restored.

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.