Verses with the word boast in the New Testament (9 verses):

Romans 2:17
Behold, thou art called a Jew, and restest in the law, and makest thy boast of God,

Romans 2:23
Thou that makest thy boast of the law, through breaking the law dishonourest thou God?

Romans 11:18
Boast not against the branches. But if thou boast, thou bearest not the root, but the root thee.

2 Corinthians 9:2
For I know the forwardness of your mind, for which I boast of you to them of Macedonia, that Achaia was ready a year ago; and your zeal hath provoked very many.

2 Corinthians 10:8
For though I should boast somewhat more of our authority, which the Lord hath given us for edification, and not for your destruction, I should not be ashamed:

2 Corinthians 10:13
But we will not boast of things without our measure, but according to the measure of the rule which God hath distributed to us, a measure to reach even unto you.

2 Corinthians 10:16
To preach the gospel in the regions beyond you, and not to boast in another man's line of things made ready to our hand.

2 Corinthians 11:16
I say again, Let no man think me a fool; if otherwise, yet as a fool receive me, that I may boast myself a little.

Ephesians 2:9
Not of works, lest any man should boast.