Psalm 136 opens with “Give thanks to the Lord, for he is good, for his steadfast love [mercy] endures forever.”
Each of the following 26 verses of this Psalm declare “for for his steadfast love [mercy] endures forever.”
Mark the one sole cause of his bounty—For his mercy endureth for ever. He hath done all things from this motive; and because his mercy never ceases, he will continue to multiply deeds of love world without end. Let us with all our powers of heart and tongue give thanks unto the holy name of Jehovah for ever and ever.