KJV:
Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ.
NASB:
See to it that no one takes you captive through philosophy and empty deception, according to the tradition of men, according to the elementary principles of the world, rather than according to Christ.
KJV:
Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word, or our epistle.
NASB:
So then, brethren, stand firm and hold to the traditions which you were taught, whether by word of mouth or by letter from us.
KJV:
Now we command you, brethren, in the name of our Lord Jesus Christ, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which he received of us.
NASB:
Now we command you, brethren, in the name of our Lord Jesus Christ, that you keep away from every brother who leads an unruly life and not according to the tradition which you received from us.