Matthew 26:22

And they being exceedingly sorrowful, began each one of them to say to Him, Lord, whether am I the one?

Mark 14:19-20

And they began to be grieved, and to say to Him one by one, Whether am I the one? And another, Whether am I the one?

Luke 22:23

And they began to inquire among themselves, who then of them is the one of them about to do this.

John 13:22-25

Then the disciples began to look to one another, being at a loss concerning which one He speaks.

John 21:17

He says to him a third time; Simon, the son of Jonah, do you love me as a friend? Peter was grieved, because He said to him the third time, Do you love me as a friend? And he says to Him, Lord, thou knowest all things; and thou dost understand that I love thee as a friend. He says to Him, Feed my sheeplings.

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