'Doubt' in the Bible

And {your life shall hang in doubt before you}, and you shall be startled night and day, and you shall not be confident of your life.

And immediately Jesus extended his hand [and] caught him and said to him, "[You] of little faith! Why did you doubt?"

And Jesus answered [and] said to them, "Truly I say to you, if you have faith and do not doubt, you will do not only [what was done to] the fig tree, but even if you say to this mountain, 'Be lifted up and thrown into the sea," it will happen!

Truly I say to you that whoever says to this mountain, 'Be lifted up and thrown into the sea!' and does not doubt in his heart, but believes that what he says will happen, it will be [done] for him.

Therefore let all the house of Israel know beyond a doubt, that God has made him both Lord and Christ--this Jesus whom you crucified!"

And have mercy on those who doubt,