Mark 2:18-22 “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? 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. But the days will come, when the bridegroom shall be taken away from them, and then shall they fast in those days. No man also seweth a piece of new cloth on an old garment: else the new piece that filled it up taketh away from the old, and the rent is made worse. And no man putteth new wine into old bottles: 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.”
When Jesus died on the cross, it was a turning point in the way that God deals with the human race. Jesus points out the stark contrast between the Old Testament and the New Testament ages. During this New Testament age God is doing a completely new thing. The atonement, the Church, the indwelling Holy Spirit, and Holy Spirit baptism are all new to this dispensation. The dispensation of the Law could not accommodate the change from a chosen nation (Israel) to a new body for our Lord (the Church). Every born-again person is now in the body of Christ, baptized (buried) into that body by the Holy Spirit.