Matthew 9:14

Then the disciples of John came to him, saying, Why do we and the Pharisees fast often, but thy disciples do not fast?

Matthew 11:2

Now when John had heard in the prison the works of the Christ, he sent two of his disciples,

John 3:25

Then there arose a question between the disciples of John and the Jews about purifying.

John 4:1

When therefore the Lord knew how the Pharisees had heard that Jesus made and baptized more disciples than John

Proverbs 20:6

Most men will proclaim each one his own mercy, but who can find a man of truth?

Matthew 6:16

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 already have their reward.

Matthew 11:18-19

For John came neither eating nor drinking, and they say, He has a devil.

Mark 2:18-22

And the disciples of John and of the Pharisees did fast and therefore came and said unto him, Why do the disciples of John and of the Pharisees fast, but thy disciples fast not?

Luke 5:33-39

Then they said unto him, Why do the disciples of John fast often and make prayers and likewise the disciples of the Pharisees, but thine eat and drink?

Luke 18:9-12

And he spoke this parable unto some who trusted in themselves that they were righteous and despised others:

Treasury of Scripture Knowledge

Summary

Then came to him the disciples of John, saying, Why do we and the Pharisees fast oft, but thy disciples fast not?

Bible References

Why

Matthew 6:16
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 already have their reward.
Matthew 11:18
For John came neither eating nor drinking, and they say, He has a devil.
Proverbs 20:6
Most men will proclaim each one his own mercy, but who can find a man of truth?
Mark 2:18
And the disciples of John and of the Pharisees did fast and therefore came and said unto him, Why do the disciples of John and of the Pharisees fast, but thy disciples fast not?
Luke 5:33
Then they said unto him, Why do the disciples of John fast often and make prayers and likewise the disciples of the Pharisees, but thine eat and drink?
Luke 18:9
And he spoke this parable unto some who trusted in themselves that they were righteous and despised others: