Or to devote themselves to myths and endless genealogies. Such things promote controversial speculations rather than advancing God's work – which is by faith.
NIV
Nor to give importance to or occupy themselves with legends (fables, myths) and endless genealogies, which foster and promote useless speculations and questionings rather than acceptance in faith of God's administration and the divine training that is in faith (in that leaning of the entire human personality on God in absolute trust and confidence)--
AMP
Neither give heed to fables and endless genealogies, which minister questions, rather than godly edifying which is in faith: so do.
KJV
Have nothing to do with godless myths and old wives' tales; rather, train yourself to be godly.
NIV
But refuse and avoid irreverent legends (profane and impure and godless fictions, mere grandmothers' tales) and silly myths, and express your disapproval of them. Train yourself toward godliness (piety), [keeping yourself spiritually fit].
AMP
But refuse profane and old wives' fables, and exercise thyself rather unto godliness.
KJV
And will pay no attention to Jewish myths or to the merely human commands of those who reject the truth.
NIV
[And may show their soundness by] ceasing to give attention to Jewish myths and fables or to rules [laid down] by [mere] men who reject and turn their backs on the Truth.
AMP
Not giving heed to Jewish fables, and commandments of men, that turn from the truth.
KJV