KJV:
Therefore I write these things being absent, lest being present I should use sharpness, according to the power which the Lord hath given me to edification, and not to destruction.
NASB:
For this reason I am writing these things while absent, so that when present I need not use severity, in accordance with the authority which the Lord gave me for building up and not for tearing down.
KJV:
Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
NASB:
which is really not another; only there are some who are disturbing you and want to distort the gospel of Christ.
KJV:
But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
NASB:
But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!
KJV:
As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
NASB:
As we have said before, so I say again now, if any man is preaching to you a gospel contrary to what you received, he is to be accursed!
KJV:
Now the things which I write unto you, behold, before God, I lie not.
NASB:
(Now in what I am writing to you, I assure you before God that I am not lying.)
KJV:
But they had heard only, That he which persecuted us in times past now preacheth the faith which once he destroyed.
NASB:
but only, they kept hearing, "He who once persecuted us is now preaching the faith which he once tried to destroy."
KJV:
And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles, but privately to them which were of reputation, lest by any means I should run, or had run, in vain.
NASB:
It was because of a revelation that I went up; and I submitted to them the gospel which I preach among the Gentiles, but I did so in private to those who were of reputation, for fear that I might be running, or had run, in vain.
KJV:
And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage:
NASB:
But it was because of the false brethren secretly brought in, who had sneaked in to spy out our liberty which we have in Christ Jesus, in order to bring us into bondage.