O give thanks
yadah (yaw-daw')
cast (out), (make) confess(-ion), praise, shoot, (give) thank(-ful, -s, -sgiving).
unto the LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
for he is good
towb (tobe)
good (as an adjective) in the widest sense; used likewise as a noun
because his mercy
checed (kheh'-sed)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty
endureth for ever
`owlam (o-lawm')
concealed, i.e. the vanishing point; generally, time out of mind (past or future), i.e. (practically) eternity; frequentatively, adverbial (especially with prepositional prefix) always