Matthew 9:14

Then come to him do the disciples of John, saying, 'Wherefore do we and the Pharisees fast much, and thy disciples fast not?'

Matthew 11:2

And John having heard in the prison the works of the Christ, having sent two of his disciples,

John 3:25

there arose then a question from the disciples of John with some Jews about purifying,

John 4:1

When therefore the Lord knew that the Pharisees heard that Jesus more disciples doth make and baptize than John,

Proverbs 20:6

A multitude of men proclaim each his kindness, And a man of stedfastness who doth find?

Matthew 6:16

'And when ye may fast, be ye not as the hypocrites, of sour countenances, for they disfigure their faces, that they may appear to men fasting; verily I say to you, that they have their reward.

Matthew 11:18-19

'For John came neither eating nor drinking, and they say, He hath a demon;

Mark 2:18-22

And the disciples of John and those of the Pharisees were fasting, and they come and say to him, 'Wherefore do the disciples of John and those of the Pharisees fast, and thy disciples do not fast?'

Luke 5:33-39

And they said unto him, 'Wherefore do the disciples of John fast often, and make supplications -- in like manner also those of the Pharisees -- but thine do eat and drink?'

Luke 18:9-12

And he spake also unto certain who have been trusting in themselves that they were righteous, and have been despising the rest, this simile:

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
'And when ye may fast, be ye not as the hypocrites, of sour countenances, for they disfigure their faces, that they may appear to men fasting; verily I say to you, that they have their reward.
Matthew 11:18
'For John came neither eating nor drinking, and they say, He hath a demon;
Proverbs 20:6
A multitude of men proclaim each his kindness, And a man of stedfastness who doth find?
Mark 2:18
And the disciples of John and those of the Pharisees were fasting, and they come and say to him, 'Wherefore do the disciples of John and those of the Pharisees fast, and thy disciples do not fast?'
Luke 5:33
And they said unto him, 'Wherefore do the disciples of John fast often, and make supplications -- in like manner also those of the Pharisees -- but thine do eat and drink?'
Luke 18:9
And he spake also unto certain who have been trusting in themselves that they were righteous, and have been despising the rest, this simile: