Luke 3:9
And now also the ax is laid unto the root of the trees: every tree therefore which bringeth not forth good fruit is hewn down, and cast into the fire.
And now also the axe is laid unto the root of the trees,.... Not only to Jesse's family, which as a root in a dry ground, and to Jerusalem, the metropolis of the nation; but to the root of the vain boasting of every Jew; their descent from Abraham, the covenant made with him, their ecclesiastical state and civil polity, all which would quickly be at an end: the Romans were now among them, the axe in God's hand; by means of whom, utter ruin and destruction would be brought upon their nation, city, and temple:
every tree therefore which bringeth not forth good fruit is hewn down, and cast into the fire; See Gill on "Matthew 3:10".