“John’s disciples and the Pharisees were fasting. Some people came to Jesus and said to him, ‘Why do John’s disciples and the Pharisees’ disciples fast, but your disciples don’t?’” (Mark 2:18)
Part of Jesus’ answer to their question was, “No one patches an old coat with a new piece of cloth that will shrink. Otherwise, the new patch will shrink and rip away some of the old cloth, and the tear will become worse. People don’t pour new wine into old wineskins. If they do, the wine will make the skins burst, and both the wine and the skins will be ruined. Rather, new wine is to be poured into fresh skins.” (Mark 2:21-22)
What do new cloth, old clothes, new wine, and old wineskins have to do with fasting? Maybe it’s this: Jesus is the new and living way to the Father (Hebrews 10:20, John 14:6). He Himself is the new wine and the new cloth. We don’t need to try to fit Him into the old wineskins of rules about fasting or patch Him onto the old clothing of rituals from the former covenant. Instead we can let Him show us the realities foreshadowed by the rules and rituals and point out to us the times that fasting and other practices are helpful, important, or necessary.
(Bible verses quoted from God’s Word Translation)