Jesus explained that people could not follow both their old customs and his new teaching.

Luke 5:33-39

33 Those Jewish leaders said to Jesus, “The disciples of John the Baptizer often abstain from food to show that they want to please God, and the disciples of the Pharisees do that, too. But your disciples keep on eating and drinking! Why do not they fast like the others?” 34 To show them that it was not appropriate for his disciples to be sad and abstain from food while he was still with them [MET], Jesus said to them, “When ◄the bridegroom/man who is getting married► is with his friends at the time of the wedding, you certainly do not make his friends abstain from food, do you [RHQ]? No, you do not do that. 35 But some day he will be taken away {his enemies will take him away} from them. Then, at that time, his friends will abstain from food, because they will be sad.”

36 Then Jesus told them two parables to show them that those who desire to live according to God’s new message should not be forced to obey the old religious traditions like ◄fasting/abstaining from food►, and that those who know only the old traditions are not eager to accept new ones [MET]. He said, “People never tear a piece of cloth from a new garment and attach it to an old garment to mend it. If they did that, not only would they be ruining the new garment by tearing it, but the new piece of cloth would not match the old garment. 37 Neither does anyone put freshly-squeezed grape juice into old skin bags to store it. If anyone did that, the grape juice would burst the skin bags because they would not stretch when the new wine ferments and expands. Then the skin bags would be ruined, and the wine would also be spilled. 38 On the contrary, new wine must be put into new wineskins.

39 Furthermore, those who have drunk only old wine are content with that. They do not want to drink the new wine, because they say, ‘The old wine is [MET] fine!’ ”