Matthew 9:16-17

16 Then Jesus said, ‘Nobody uses a piece of new cloth to mend an old coat. If he does, the new cloth will cause the old cloth to tear again. It will make a bigger hole than before.

17 Nobody pours new wine into old wineskins. If he does that, the new wine will tear the old wineskins. He will lose the wine and the wineskins will be useless. Instead, you must put new wine into new wineskins. Then there will be nothing to spoil the wine or the wineskins.’

9:17The old wineskins were like the old Jewish rules. The new wine was like the things that Jesus was now teaching. Jesus' teaching needed a new way of thinking.