Matthew 6:16

And when ye fast, be not as the hypocrites, affecting a gloomy look: for they disfigure their visages, that they may make a shew of fasting to men. Verily I say unto you, That they have their reward.

Matthew 6:2

Therefore when thou givest alms, sound not a trumpet before thee, as the hypocrites do, in the synagogues, and in the streets, that they may have glory from men. Verily I say unto you, They receive their reward.

Matthew 6:5

And when thou prayest, be not as the hypocrites: for they love standing in the synagogues and at the corners of the streets, to pray, that they may make a shew to men. Verily I say unto you, That they have their reward.

Luke 18:12

I keep a fast twice a week, I pay the tenth of all things I possess.

Matthew 9:14-15

Then came unto him disciples of John, saying, Why do we and the Pharisees keep many fasts, but thy disciples fast not?

Mark 2:18

And the disciples of John and of the Pharisees kept fasts; and they came and said to him, Wherefore do the disciples of John, and of the Pharisees, fast? but thy disciples keep no fast.

Luke 2:37

though she was now a widow, of about eighty-four years, who departed not from the temple, attending the divine service, with fastings and prayers night and day:

Acts 10:30

Then Cornelius said, Four days ago I was fasting till this hour; and at the ninth hour I was praying in my house, and, lo! a man stood before me in shining apparel,

Acts 13:2-3

And as they were employed in the ministry, and kept a fast, the Holy Ghost said, Set apart for me now both Barnabas and Saul for the work whereunto I have called them.

Acts 14:23

Then appointing them presbyters in every city, by prayer with fastings they commended them to the Lord, on whom they had believed.

1 Corinthians 7:5

Defraud not one another, except it may be by consent occasionally, that ye may have more leisure for fasting and prayer; and come together again, lest Satan tempt you through your incontinence.

2 Corinthians 6:5

in stripes, in imprisonments, in tumults, in labours, in watchings, in fastings,

2 Corinthians 11:27

in labour and travail, in watchings often, in fastings frequently, in hunger and thirst, in cold and nakedness;

Treasury of Scripture Knowledge

Summary

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.

Bible References

When

Matthew 9:14
Then came unto him disciples of John, saying, Why do we and the Pharisees keep many fasts, but thy disciples fast not?
Luke 2:37
though she was now a widow, of about eighty-four years, who departed not from the temple, attending the divine service, with fastings and prayers night and day:
Acts 10:30
Then Cornelius said, Four days ago I was fasting till this hour; and at the ninth hour I was praying in my house, and, lo! a man stood before me in shining apparel,
Acts 13:2
And as they were employed in the ministry, and kept a fast, the Holy Ghost said, Set apart for me now both Barnabas and Saul for the work whereunto I have called them.
Acts 14:23
Then appointing them presbyters in every city, by prayer with fastings they commended them to the Lord, on whom they had believed.
1 Corinthians 7:5
Defraud not one another, except it may be by consent occasionally, that ye may have more leisure for fasting and prayer; and come together again, lest Satan tempt you through your incontinence.
2 Corinthians 6:5
in stripes, in imprisonments, in tumults, in labours, in watchings, in fastings,
2 Corinthians 11:27
in labour and travail, in watchings often, in fastings frequently, in hunger and thirst, in cold and nakedness;

Be

Matthew 6:2
Therefore when thou givest alms, sound not a trumpet before thee, as the hypocrites do, in the synagogues, and in the streets, that they may have glory from men. Verily I say unto you, They receive their reward.
Mark 2:18
And the disciples of John and of the Pharisees kept fasts; and they came and said to him, Wherefore do the disciples of John, and of the Pharisees, fast? but thy disciples keep no fast.
Luke 18:12
I keep a fast twice a week, I pay the tenth of all things I possess.