'Knew' in the Bible

Now there arose a new king over Egypt, who knew not Joseph.

And when the children of Israel saw it, they said one to another, What is it? For they knew not what it was. And Moses said unto them, It is the bread which Jehovah hath given you to eat.

And it came to pass, when Moses came down from mount Sinai with the two tables of the testimony in Moses hand, when he came down from the mount, that Moses knew not that the skin of his face shone by reason of his speaking with him.