Charles Ellicott Commentary Isaiah 38:20

"Jehovah is [ready] to save me: Therefore we will sing my songs with stringed instruments All the days of our life in the house of Jehovah." — Isaiah 38:20 (ASV)

Was ready. — Better, as fitting in with the praise and hope of the close of the prayer, is ready.

We will sing. — The king identifies himself with the great congregation, perhaps even more closely with the Levite minstrels of the Temple whom he had done so much to train and reorganize.