'Doubting' in the Bible

Then the disciples looked one on another, doubting of whom he spake.

Arise therefore, and get thee down, and go with them, doubting nothing: for I have sent them.

And the spirit bade me go with them, nothing doubting. Moreover these six brethren accompanied me, and we entered into the man's house:

I will therefore that men pray every where, lifting up holy hands, without wrath and doubting.