'Knew' in the Bible

"'When a person sins in that he hears a public curse against one who fails to testify and he is a witness (he either saw or knew what had happened) and he does not make it known, then he will bear his punishment for iniquity.

And if any one sin, and do any of the things which Jehovah hath commanded not to be done; though he knew it not, yet is he guilty, and shall bear his iniquity.

And he shall bring a ram without blemish out of the small cattle, according to thy valuation, as trespass-offering, unto the priest; and the priest shall make atonement for him concerning his inadvertence wherein he sinned inadvertently, and knew it not, and it shall be forgiven him.