Charles Ellicott Commentary Jonah 2:1

"Then Jonah prayed unto Jehovah his God out of the fish`s belly." — Jonah 2:1 (ASV)

Then Jonah prayed.— This introduction, to what is in reality a psalm of thanksgiving, has its parallel in Hannah’s song (1 Samuel 2:1–10), which is introduced in the same way. Compare also the Note appended by the psalm collector at the end of Psalms 72:20, “The prayers of David the son of Jesse are ended.”