(1-4) Comp. Psalms 115:9-13, where a similar choral arrangement is found.
Related Commentaries of Psalms 118:1
Psalms 118:1-4
1 O give thanks unto the LORD; for he is good: because his mercy endureth for ever.
2 Let Israel now say, that his mercy endureth for ever.
3 Let the house of Aaron now say, that his mercy endureth for ever.
4 Let them now that fear the LORD say, that his mercy endureth for ever.