'Doubt' in the Bible

"Therefore let the whole House of Israel know beyond all doubt that God has made Him both LORD and CHRIST--this Jesus whom you crucified."

So he came to Jerusalem and made several attempts to associate with the disciples, but they were all afraid of him, being in doubt as to whether he himself was a disciple.

When the natives saw the creature hanging to his hand, they said to one another, "Beyond doubt this man is a murderer, for, though saved from the sea, unerring Justice does not permit him to live."