Albert Barnes Commentary Psalms 57:9

"I will give thanks unto thee, O Lord, among the peoples: I will sing praises unto thee among the nations." — Psalms 57:9 (ASV)

I will praise you, O Lord, among the people - So great a deliverance as he here hoped for would make it proper that he should celebrate the praise of God in the most public manner; that he should make his goodness known as far as possible among the nations. See the notes at Psalms 18:49.