Adam Clarke on Luke 22:26

Let him be as the younger - Dr. Lightfoot justly conjectures that Peter was the eldest of all the disciples; and he supposes that the strife was kindled between him and the sons of Zebedee, James and John. These three disciples were those whom Christ had distinguished by peculiar marks of his favor; and therefore it is natural to conclude that the strife lay between these three, the two brothers and Peter. Shall we or Peter be at the head? Neither, says our Lord. Let him, Peter, who is chief (ὁ μειζων, the eldest) among you, be as, John, ὁ νεωτερος, the younger. The younger part of the disciples do not appear to have taken any part in this contention; and our Lord shows Peter, and the sons of Zebedee, that they must be as unambitious as the younger in order to be acknowledged as his disciples. Dr. Lightfoot thinks that Peter was the mover of this strife, and therefore our Lord rebukes him by name.