'Doctrines' in the Bible

But in vain do they worship me, Teaching as their doctrines the precepts of men.

But in vain do they worship me, Teaching as their doctrines the precepts of men.

(all which things are to perish with the using), after the precepts and doctrines of men?

But the Spirit saith expressly, that in later times some shall fall away from the faith, giving heed to seducing spirits and doctrines of demons,