John 13:22 - Then the disciples looked one on another, doubting G639 of whom he spake.
Acts 25:20 - And because I doubted G639 of such manner of questions, I asked him whether he would go to Jerusalem, and there be judged of these matters.
2 Corinthians 4:8 - We are troubled on every side, yet not distressed; we are perplexed, G639 but not in despair;
Galatians 4:20 - I desire to be present with you now, and to change my voice; for I stand in doubt G639 of you.