'Vows' in the Bible

"Cursed is the deceiver who has an acceptable male in his flock, and vows to give it, but sacrifices a mutilated one to the LORD. Indeed, I am a great king," says the LORD of the Heavenly Armies, "and my name is feared among the Gentiles."

But you say, “Why [does He reject it]?” Because the Lord has been a witness between you and the wife of your youth, against whom you have dealt treacherously. Yet she is your marriage companion and the wife of your covenant [made by your vows].