Boasting

Boasting Excluded
Then what becomes of our boasting? It is excluded. By what kind of law? By a law of works? No, but by the law of faith. (Romans 3:27 ESV)

For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast. (Ephesians 2:8-9 KJV)

Boasting Allowed
Thus saith the LORD, Let not the wise man glory in his wisdom, neither let the mighty man glory in his might, let not the rich man glory in his riches: But let him that glorieth glory in this, that he understandeth and knoweth me, that I am the LORD which exercise lovingkindness, judgment, and righteousness, in the earth: for in these things I delight, saith the LORD. (Jeremiah 9:23-24 KJV)

But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world. (Galatians 6:14 KJV)

Therefore, as it is written: "Let the one who boasts boast in the Lord." (1 Corinthians 1:31 NIV)

But, "Let the one who boasts boast in the Lord." (2 Corinthians 10:17 NIV)

Boasting Forbidden
Each one should test his own actions. Then he can take pride in himself, without comparing himself to somebody else, (Galatians 6:4 NIV)

For even the circumcised don’t keep the law themselves; however, they want you to be circumcised in order to boast about your flesh. (Galatians 6:13 HCSB)