John 13:22 KJV

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

In context

21 When Jesus had thus said, he was troubled in spirit, and testified, and said, Verily, verily, I say unto you, that one of you shall betray me.

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

23 Now there was leaning on Jesus’ bosom one of his disciples, whom Jesus loved.