Matthew 9:14

Then John's disciples came to him, saying, "Why do we and the Pharisees fast often, but your disciples don't fast?"

Matthew 11:2

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

John 3:25

There arose therefore a questioning on the part of John's disciples with some Jews about purification.

John 4:1

Therefore when the Lord knew that the Pharisees had heard that Jesus was making and baptizing more disciples than John

Proverbs 20:6

Many men claim to be men of unfailing love, but who can find a faithful man?

Matthew 6:16

"Moreover when you fast, don't be like the hypocrites, with sad faces. For they disfigure their faces, that they may be seen by men to be fasting. Most certainly I tell you, they have received their reward.

Matthew 11:18-19

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

Mark 2:18-22

John's disciples and the Pharisees were fasting, and they came and asked him, "Why do John's disciples and the disciples of the Pharisees fast, but your disciples don't fast?"

Luke 5:33-39

They said to him, "Why do John's disciples often fast and pray, likewise also the disciples of the Pharisees, but yours eat and drink?"

Luke 18:9-12

He spoke also this parable to certain people who were convinced of their own righteousness, and who despised all 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 you fast, don't be like the hypocrites, with sad faces. For they disfigure their faces, that they may be seen by men to be fasting. Most certainly I tell you, they have received their reward.
Matthew 11:18
For John came neither eating nor drinking, and they say, 'He has a demon.'
Proverbs 20:6
Many men claim to be men of unfailing love, but who can find a faithful man?
Mark 2:18
John's disciples and the Pharisees were fasting, and they came and asked him, "Why do John's disciples and the disciples of the Pharisees fast, but your disciples don't fast?"
Luke 5:33
They said to him, "Why do John's disciples often fast and pray, likewise also the disciples of the Pharisees, but yours eat and drink?"
Luke 18:9
He spoke also this parable to certain people who were convinced of their own righteousness, and who despised all others.