KJV:
Be kindly affectioned one to another with brotherly love; in honour preferring one another;
NASB:
Be devoted to one another in brotherly love; give preference to one another in honor;
KJV:
But as touching brotherly love ye need not that I write unto you: for ye yourselves are taught of God to love one another.
NASB:
Now as to the love of the brethren, you have no need for anyone to write to you, for you yourselves are taught by God to love one another;
KJV:
Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
NASB:
Since you have in obedience to the truth purified your souls for a sincere love of the brethren, fervently love one another from the heart,