Jonah
Jonah 3:5BSB·traditional attribution

And the Ninevites believed God. They proclaimed a fast and dressed in sackcloth, from the greatest of them to the least.

John Calvin Reformed @genevareformer

One thing, escaped me in the third verse: Jonah said that Nineveh was a city great to God. This form of speech is common in Scripture: for the Hebrews call that Divine, whatever it be, that is superior or excellent: so they say, the cedars of God, the mountains of God, the fields of God, when they are superior in height or in any other respect.

John Gill Reformed Baptist @doctorgill

So the people of Nineveh believed God,.... Or "in God" (r): in the word of the Lord, as the Targum; they believed there was a God, and that he, in whose name Jonah came, was the true God; they believed the word the prophet spake was not the word of man, but, the word of God; faith came by hearing the word, which is the...

Jamieson-Fausset-Brown Reformed @jfbcommentary

believed God--gave credit to Jonah's message from God; thus recognizing Jehovah as the true God. fast . . . sackcloth--In the East outward actions are often used as symbolical expressions of inward feelings. So fasting and clothing in sackcloth were customary in humiliation. Compare in Ahab's case, parallel to that of Nineveh, both receiving a respite on penitence (; ; ). from the greatest . . .