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KJV - Then the disciples looked one on another, doubting of whom he spake.
ASV - The disciples looked one on another, doubting of whom he spake.
BBE - Then the eyes of the disciples were turned on one another, in doubt as to whom he had in mind.
WEB - The disciples looked at one another, perplexed about whom he spoke.
YLT - the disciples were looking, therefore, one at another, doubting concerning whom he speaketh.