KJV:
Not giving heed to Jewish fables, and commandments of men, that turn from the truth.
NASB:
not paying attention to Jewish myths and commandments of men who turn away from the truth.
KJV:
Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip.
NASB:
For this reason we must pay much closer attention to what we have heard, so that we do not drift away from it.
KJV:
For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.
NASB:
For the one concerning whom these things are spoken belongs to another tribe, from which no one has officiated at the altar.
KJV:
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:
NASB:
So we have the prophetic word made more sure, to which you do well to pay attention as to a lamp shining in a dark place, until the day dawns and the morning star arises in your hearts.