But I will sacrifice to you with the voice of thanksgiving. I will pay that which I have vowed. Salvation belongs to Yahweh."
And he afterwards mentions his vows, I will pay, he says, my vows. We have stated elsewhere in what light we are to consider vows. The holy Fathers did not vow to God, as the Papists of this day are wont to do, who seek to pacify God by their frivolous practices; one abstains for a certain time from meat, another puts on sackcloth, another undertakes a pilgrimage, and another obtrudes on God some new ceremony. There was nothing of this kind in the vows of the holy Fathers; but a vow was the mere act of thanksgiving, or a testimony of gratitude: and so Jonah joins his vows here with the sacrifice of praise. We hence learn that they were not two different things; but he repeats the same thing twice. Jonah, then, had declared his vow to God for no other purpose but to testify his gratitude. 