The ax is already lying at the roots of the trees. All the trees that don't produce good fruit will be cut down. They will be thrown into the fire.
"I baptize you with water, calling you to turn away from your sins. But after me, one will come who is more powerful than I am. And I'm not fit to carry his sandals. He will baptize you with the Holy Spirit and with fire.
His pitchfork is in his hand to clear the straw from his threshing floor. He will gather his wheat into the storeroom. But he will burn up the husks with fire that can't be put out."