'Knew' in the Bible

And when they lifted up their eyes afar off, and knew him not, they lifted up their voice, and wept; and they rent every one his mantle, and sprinkled dust upon their heads toward heaven.

Oh that I knew where I might find him! that I might come even to his seat!

I was a father to the poor: and the cause which I knew not I searched out.

Who is he that hideth counsel without knowledge? therefore have I uttered that I understood not; things too wonderful for me, which I knew not.