Hebrews 6:8

but, if it 'bears thorns and thistles,' it is regarded as worthless, it is in danger of being 'cursed,' and its end will be the fire.

Luke 13:7-9

So he said to his gardener 'Three years now I have come to look for fruit on this fig tree, without finding any! Cut it down. Why should it rob the soil?'

John 15:6

If any one does not remain united to me, he is thrown away, as a branch would be, and withers up. Such branches are collected and thrown into the fire, and are burnt.

Matthew 3:10

Already the axe is lying at the root of the trees. Therefore every tree that fails to bear good fruit will be cut down and thrown into the fire.

Matthew 7:19

Every tree that fails to bear good fruit is cut down and thrown into the fire.

Matthew 25:41

Then he will say to those on his left 'Go from my presence, accursed, into the 'aeonian fire which has been prepared for the Devil and his angels.'

Mark 11:14

So, addressing the tree, he exclaimed: "May no man ever again eat of your fruit!" And his disciples heard what he said.

Mark 11:21

Then Peter recollected what had occurred. "Look, Rabbi," he exclaimed, "the fig-tree which you doomed is withered up!"

Hebrews 10:27

there is only a fearful anticipation of judgment, and a burning indignation which will destroy all opponents.

Hebrews 12:17

For you know that even afterwards, when he wished to claim his father's blessing, he was rejected--for he never found an opportunity to repair his error--though he begged for the blessing with tears.

Revelation 20:15

and all whose names 'were not found written in the Book of Life' were hurled into the lake of fire.

Treasury of Scripture Knowledge

Summary

But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.

Bible References

Beareth

Hebrews 12:17
For you know that even afterwards, when he wished to claim his father's blessing, he was rejected--for he never found an opportunity to repair his error--though he begged for the blessing with tears.
Mark 11:14
So, addressing the tree, he exclaimed: "May no man ever again eat of your fruit!" And his disciples heard what he said.
Luke 13:7
So he said to his gardener 'Three years now I have come to look for fruit on this fig tree, without finding any! Cut it down. Why should it rob the soil?'

Whose

Hebrews 10:27
there is only a fearful anticipation of judgment, and a burning indignation which will destroy all opponents.
Matthew 3:10
Already the axe is lying at the root of the trees. Therefore every tree that fails to bear good fruit will be cut down and thrown into the fire.
Matthew 7:19
Every tree that fails to bear good fruit is cut down and thrown into the fire.
Matthew 25:41
Then he will say to those on his left 'Go from my presence, accursed, into the 'aeonian fire which has been prepared for the Devil and his angels.'
John 15:6
If any one does not remain united to me, he is thrown away, as a branch would be, and withers up. Such branches are collected and thrown into the fire, and are burnt.
Revelation 20:15
and all whose names 'were not found written in the Book of Life' were hurled into the lake of fire.

General references

Mark 3:28
I tell you that men will be forgiven everything--their sins, and all the slanders that they utter;
Luke 12:10
Every one who shall say anything against the Son of Man will be forgiven, but for him who slanders the Holy Spirit there will be no forgiveness.
Luke 14:30
And say 'Here is a man who began to build and was not able to finish!'
Luke 23:31
If what you see is done while the tree is green, what will happen when it is dry?"
Jude 1:22
To some show pity, because they are in doubt. 'Drag them out of the fire,' and save them.