“Now John's disciples and the Pharisees were fasting. And people came and said to him, “Why do John's disciples and the disciples of the Pharisees fast, but your disciples do not fast?” And Jesus said to them, “Can the wedding guests fast while the bridegroom is with them? As long as they have the bridegroom with them, they cannot fast. The days will come when the bridegroom is taken away from them, and then they will fast in that day. No one sews a piece of unshrunk cloth on an old garment. If he does, the patch tears away from it, the new from the old, and a worse tear is made. And no one puts new wine into old wineskins. If he does, the wine will burst the skins—and the wine is destroyed, and so are the skins. But new wine is for fresh wineskins.” - Mark 2:18-22, ESV.

I had trouble understanding Jesus’ point, so I searched on a familiar website and found the answer. Check it out.

“Jesus had come to establish a new era. Now was a time for joy in the presence of the bridegroom. The disciples of Jesus would mourn and fast later. But while He was here among them, they would celebrate the forgiveness, fellowship, freedom, and new direction that His coming had ushered in. In other words, Jesus’ parables said, “Out with the old way of thinking and doing things, and in with the new.” If the Jews did not adjust their rigid religious mindset, they would experience a loss much like that of the ruined garments and wineskins.” - https://www.gotquestions.org/new-wine-into-old-wineskins.html

Jesus did a new thing to draw people to a relationship with the Father. He offered them a new covenant in His own blood. That was different from what had been done previously in the OT sacrificial system. It was new, and the Pharisees didn't trust it. But if they wanted salvation and to be part of the Kingdom of Christ, they had to get on board or miss out. Some accepted the change, but some did not, and they experienced loss.

Such is the human response to any change. I have always said everybody hates change unless it is their idea. And when a change involves practices and beliefs tied to how we express and work out our religion, we don’t readily trust it. Maybe we shouldn’t, unless of course the change comes from Jesus. If that is the case, trying to fit Jesus’ new idea into our usual scheme of things would only bust those practices.

Any change that Jesus makes can be trusted. - Pastor Mike

BTW, Alabama changed the drinking age to 34. They wanted to keep alcohol out of the high schools.