'Doubt' in the Bible

And they were all surprised and in doubt saying to one another, What is the reason of this?

Now while Peter was in doubt as to the purpose of this vision, the men who were sent by Cornelius, having made search for Simon's house, came to the door,

Because we have knowledge that some who went from us have been troubling you with their words, putting your souls in doubt; to whom we gave no such order;

And when the people saw it hanging on his hand, they said to one another, Without doubt this man has put someone to death, and though he has got safely away from the sea, God will not let him go on living.