Genesis 42:8
Now though Joseph saw that these were his brothers, they had no idea who he was.
Genesis 37:2
These are the generations of Jacob: Joseph, a boy seventeen years old, was looking after the flock, together with his brothers, the sons of Bilhah and Zilpah, his father's wives; and Joseph gave their father a bad account of them.
Luke 24:16
But their eyes were not open that they might have knowledge of him.
John 20:14
And then looking round, she saw Jesus there, but had no idea that it was Jesus.
John 21:4
Now very early in the morning Jesus was there by the edge of the sea (though the disciples were not conscious that it was Jesus).