NOBODY PUTS NEW WINE IN OLD ODRES

Mattew 9:17
And nobody puts new wine into old wineskins, because then the wineskins burst, the wine spills and the wineskins are lost; Instead, new wine is poured into new wineskins, and both are preserved.
(NASB)

Before knowing the word of God, every person lives their life in their own way and obviously it is a life that pleases God at all, therefore in this parable we find a great teaching that teaches us the lifestyle that we must decide to live once we We know Jesus through the gospel since we cannot live in the same way that we did before.

When Jesus says this parable to his disciples, he is telling them that it is useless to pour new wine into old wineskins because they would burst and the wine would be lost.
In the same way, it gives us to understand that if we are in Christ we are a new creature and we must have new patterns of life that go hand in hand with the word of God which urges us to leave the old behind what does not build and start a new life.

Source

There is new life in Jesus

In this sense he was giving a detailed literal explanation about the parable where he emphatically describes that a new wine ferments and breaks old wineskins that do not yield to the energy released by the fermentation of the wine. The new wine has to be put into new wineskins, which yield to the released energies.
(biblical comments)

The new wineskin is the glory that flows from the heart of God, it is the life of Christ, which comes to liberate, to transform, to heal, to bring abundant life, to do something new in me or in you, that comes to change my family, to change my everything, is to make a revolution in my life, that new wine is the final touch that I need
(Biblical theological dictionary)

We all need to pour new wine into new wineskins because the past life no longer fits into old things and it is in this way that we can preserve our full life in Jesus Christ

In such a way that if we are in Christ we are a new creature and the old things pass to give life to the new