John Gill Commentary Jonah 2:9

"But I will sacrifice unto thee with the voice of thanksgiving; I will pay that which I have vowed. Salvation is of Jehovah." — Jonah 2:9 (ASV)

But I will sacrifice to you with the voice of thanksgiving ,
&c.] Not only offer up a legal sacrifice in a ceremonial way, when he came to Jerusalem; but along with it the spiritual sacrifice of praise, which he knew was more acceptable unto God; and thus Christ, his antitype, upon his deliverance from his enemies, (Psalms 22:22Psalms 22:25) (Psalms 69:30Psalms 69:31) ; I will pay [that] I vowed ;
when he was in distress; as that he would sacrifice after the above manner, or behave in a better manner for the future than he had done; and particularly would go to Nineveh, if the Lord thought fit to send him again: salvation [is] of the Lord ;
this was the ground of the faith and hope of Jonah when at the worst, and the matter of his present praise find thanksgiving.

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FOOTNOTES:

• F7: than usual, which increases the sense; and denotes, that all kind of salvation is of the Lord, temporal, spiritual, and eternal; not only this salvation from the devouring waves of the sea, and from the grave of the fish's belly, was of the Lord; but his deliverance from the terrors of the Lord, and the sense he had of his wrath, and the peace and pardon he now partook of, were from the Lord, as well as eternal salvation in the world to come, and the hope of it. All temporal salvations and deliverances are from the Lord, and to him the glory of them belongs; and his name should be praised on account of them; which Jonah resolved to do for himself: and so is spiritual and eternal salvation; it is of Jehovah the Father, as to the original spring and motive of it, which is his grace, and not men's works, and is owing to his wisdom, and not men's, for the plan and form of it; it is of Jehovah the Son, as to the impetration of it, who only has wrought it out; and it is of Jehovah the Spirit, as to the application of it to particular persons; and therefore the glory of it belongs to all the three Persons, and should be given them. This is the epiphonema or conclusion of the prayer or thanksgiving; which shows that it was, as before observed, put into this form or order, after the salvation was wrought; though that is related afterwards, as it is proper it should, and as the order of the narration required.
  (htewsy) .