Sailors who prayed to their gods (1:5) received no answer. Jonah rejects idols as useless. The Hebrew phrase is “empty emptiness.” Those who pursue emptiness abandon fullness, here described as grace, in Hebrew חֶסֶד (ḥesed), the deep devoted love of God for his people. Instead, from his prayer room, Jonah promises to do three things: (1) Sing a song of thanksgiving. Such a song would be much like Jonah 2:2–9. (2) Offer sacrifice (cf. 1:16). (3) Make a vow to the LORD. The content of the vow here