James 4:16

But now you boast in your arrogance. All such boasting is evil.

1 Corinthians 5:6

Your boasting [is] not good. Do you not know that a little leaven leavens the whole batch of dough?

Psalm 52:1

Why do you boast about evil, O mighty man? The loyal love of God [endures] {continually}.

Psalm 52:7

"Look, the man [who] would not make God his refuge, but he trusted in the greatness of his wealth; he took refuge in his destructiveness."

Proverbs 25:14

[Like] clouds and wind when there is no rain, [so too is] a man who boasts in a gift of deception.

Proverbs 27:1

Do not boast {about tomorrow}, for you do not know what the day will bring.

Isaiah 47:7-8

And you said, "I shall be an eternal mistress forever!" You did not set these [things] upon your heart; you did not remember its end.

Isaiah 47:10

And you felt secure in your wickedness; you said, "{No one} sees me." Your wisdom and your knowledge led you astray, and you said in your heart, "I [am], and besides me [there is] no one."

1 Corinthians 4:7-8

For who concedes you [superiority]? And what do you have that you did not receive? But if indeed you received [it], why do you boast as [if you] did not receive [it]?

James 3:14

But if you have bitter jealousy and selfish ambition in your hearts, do not boast and tell lies against the truth.

Revelation 18:7

As much as she glorified herself and lived in luxury, give to her so much torment and mourning, because in her heart she said, 'I sit as a queen, and am not a widow, and I will never see mourning!'

Treasury of Scripture Knowledge

Summary

But now ye rejoice in your boastings: all such rejoicing is evil.

Bible References

General references

James 3:14
But if you have bitter jealousy and selfish ambition in your hearts, do not boast and tell lies against the truth.
Psalm 52:1
Why do you boast about evil, O mighty man? The loyal love of God [endures] {continually}.
Proverbs 25:14
[Like] clouds and wind when there is no rain, [so too is] a man who boasts in a gift of deception.
Proverbs 27:1
Do not boast {about tomorrow}, for you do not know what the day will bring.
Isaiah 47:7
And you said, "I shall be an eternal mistress forever!" You did not set these [things] upon your heart; you did not remember its end.
1 Corinthians 4:7
For who concedes you [superiority]? And what do you have that you did not receive? But if indeed you received [it], why do you boast as [if you] did not receive [it]?
1 Corinthians 5:6
Your boasting [is] not good. Do you not know that a little leaven leavens the whole batch of dough?
Revelation 18:7
As much as she glorified herself and lived in luxury, give to her so much torment and mourning, because in her heart she said, 'I sit as a queen, and am not a widow, and I will never see mourning!'