So the people of Nineveh believed God, and proclaimed a fast, and p…

And when he had fasted forty days and forty nights, he was afterward an hungred.

Matthew 4:2 (KJV)

And Jesus said unto them, Can the children of the bridechamber mourn, as long as the bridegroom is with them? but the days will come, when the bridegroom shall be taken from them, and then shall they fast.

Matthew 9:15 (KJV)

Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.

Matthew 6:16 (KJV)

But thou, when thou fastest, anoint thine head, and wash thy face; That thou appear not unto men to fast, but unto thy Father which is in secret.

Matthew 6:17 (KJV)

Go, gather together all the Jews that are present in Shushan, and fast ye for me, and neither eat nor drink, three days, night or day: I also and my maidens will fast likewise.

Esther 4:16 (KJV)

Is not this the fast that I have chosen? to loose the bands of wickedness, to undo the heavy burdens, and to let the oppressed go free, and that ye break every yoke?

Isaiah 58:6 (KJV)