'Doctrine' in the Bible

Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.

But speak thou the things which become sound doctrine:

In all things shewing thyself a pattern of good works: in doctrine shewing uncorruptness, gravity, sincerity,

Not purloining, but shewing all good fidelity; that they may adorn the doctrine of God our Saviour in all things.