6 Bible Verses about Vowing To Fast

Then all the people came to persuade David to eat bread while it was yet day. But David swore, saying, "God do so to me and more also, if I taste bread or anything else till the sun goes down!"

And the men of Israel had been hard pressed that day, so Saul had laid an oath on the people, saying, "Cursed be the man who eats food until it is evening and I am avenged on my enemies." So none of the people had tasted food.

Then one of the people said, "Your father strictly charged the people with an oath, saying, 'Cursed be the man who eats food this day.'" And the people were faint.

When it was day, the Jews made a plot and bound themselves by an oath neither to eat nor drink till they had killed Paul.

They went to the chief priests and elders and said, "We have strictly bound ourselves by an oath to taste no food till we have killed Paul

But do not be persuaded by them, for more than forty of their men are lying in ambush for him, who have bound themselves by an oath neither to eat nor drink till they have killed him. And now they are ready, waiting for your consent.