English Standard Version
The disciples looked at one another, uncertain of whom he spoke.

American Standard Version
The disciples looked one on another, doubting of whom he spake.

Berean Study Bible
The disciples looked at one another, perplexed as to which of them He meant.

Douay-Rheims Bible
The disciples therefore looked one upon another, doubting of whom he spoke.

English Revised Version
The disciples looked one on another, doubting of whom he spake.

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

World English Bible
The disciples looked at one another, perplexed about whom he spoke.

Young's Literal Translation
the disciples were looking, therefore, one at another, doubting concerning whom he speaketh.

John 13:22 Additional Translations ...