Verses with the word doubting in the New Testament (4 verses):

John 13:22
Then the disciples looked one on another, doubting of whom he spake.

Acts 10:20
Arise therefore, and get thee down, and go with them, doubting nothing: for I have sent them.

Acts 11:12
And the Spirit bade me go with them, nothing doubting. Moreover these six brethren accompanied me, and we entered into the man's house:

1 Timothy 2:8
I will therefore that men pray every where, lifting up holy hands, without wrath and doubting.