Albert Barnes Commentary Psalms 118:3

"Let the house of Aaron now say, That his lovingkindness [endureth] for ever." — Psalms 118:3 (ASV)

Let the house of Aaron now say ... - . The ministers of religion. They are appointed to serve God; to lead in his worship; to defend his truth; to maintain 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, which they can use in defending the truth, and in illustrating the power of religion.