NET
17 Now I urge you, brothers and sisters, to watch out for those who create dissensions and obstacles contrary to the teaching that you learned. Avoid them!
Darby
17 But I beseech you, brethren, to consider those who create divisions and occasions of falling, contrary to the doctrine which *ye* have learnt, and turn away from them.
KJV
17 Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.