Matthew 3:10

Even now the ax is lying at the root of the trees: therefore, every tree that does not bring forth good fruit is cut down and thrown into the fire.

Matthew 13:15

For the heart of this people has become fat; and with their ears they hear heavily; and their eyes they have closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should turn to me, and I should give them health.

Matthew 13:19

When any one hears the word of the kingdom, and understands it not, the wicked one comes and catches away that which was sown in his heart. This is he that received seed by the way side.

John 15:6

If any one abide not in me, he is thrown out as a branch, and withers; and such are gathered, and thrown into the fire, and burned.

Romans 1:28

And as they refused to acknowledge God, God delivered them up to an undiscerning mind, to do detestable things;

Romans 1:31

without understanding, covenant-breakers, without natural affection, implacable, unmerciful;

1 Thessalonians 2:16

forbidding us to speak to the Gentiles that they may be saved, in order that they may fill up their sins at all times: but the wrath is coming upon them to the full.

2 Thessalonians 1:8-9

in flaming fire, to take vengeance on those who know not God, and who obey not the gospel of our Lord Jesus Christ;

James 2:13

For he shall have judgment without mercy, who has shown no mercy. Mercy glories over judgment.

Treasury of Scripture Knowledge

Summary

When the boughs thereof are withered, they shall be broken off: the women come, and set them on fire: for it is a people of no understanding: therefore he that made them will not have mercy on them, and he that formed them will shew them no favour.

The boughs

Bible References

The boughs

Matthew 3:10
Even now the ax is lying at the root of the trees: therefore, every tree that does not bring forth good fruit is cut down and thrown into the fire.
John 15:6
If any one abide not in me, he is thrown out as a branch, and withers; and such are gathered, and thrown into the fire, and burned.

For it is

Matthew 13:15
For the heart of this people has become fat; and with their ears they hear heavily; and their eyes they have closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should turn to me, and I should give them health.
Romans 1:28
And as they refused to acknowledge God, God delivered them up to an undiscerning mind, to do detestable things;