'Cast into the Fire' in the Bible

And now the ax is laid to the root of the trees; every tree therefore, which yieldeth not good fruit, is cut down and cast into the fire.

Now if God so clothe the grass of the field, which is growing to-day, and to-morrow is cast into the fire, will He not much more clothe you, O ye of little faith?

and every tree that bringeth not forth good fruit is cut down and cast into the fire.