(18-22) And the disciples of John.... used to fast. — Better, were fasting. See Notes on Matthew 9:14-17. The only difference in detail between the two accounts is that in St. Matthew the disciples of John are more definitely specified as being the questioners.
Related Commentaries of Mark 2:18
Mark 2:18-22
18 And the disciples of John and of the Pharisees used to fast: and they come and say unto him, Why do the disciples of John and of the Pharisees fast, but thy disciples fast not?
19 And Jesus said unto them,Can the children of the bridechamber fast, while the bridegroom is with them? as long as they have the bridegroom with them, they cannot fast.
20 But the days will come, when the bridegroom shall be taken away from them, and then shall they fast in those days.
21 No man also seweth a piece of new clotha on an old garment: else the new piece that filled it up taketh away from the old, and the rent is made worse.
22 And no man putteth new wine into old bottles:b else the new wine doth burst the bottles, and the wine is spilled, and the bottles will be marred: but new wine must be put into new bottles.