'Know' in the Bible

But do you want to know, vain man, that faith apart from works is dead?

You adulterers and adulteresses, don't you know that friendship with the world is enmity with God? Whoever therefore wants to be a friend of the world makes himself an enemy of God.

Whereas you don't know what your life will be like tomorrow. For what is your life? For you are a vapor, that appears for a little time, and then vanishes away.

let him know that he who turns a sinner from the error of his way will save a soul from death, and will cover a multitude of sins.