Jamieson, Fausset and Brown on Luke 9:54

54. James and John--not Peter, as we should have expected, but those "sons of thunder" (Mr 3:17), who afterwards wanted to have all the highest honors of the Kingdom to themselves, and the younger of whom had been rebuked already for his exclusiveness (Lu 9:49, 50). Yet this was "the disciple whom Jesus loved," while the other willingly drank of His Lord's bitter cup. (See on Mr 10:38-40; and Ac 12:2). That same fiery zeal, in a mellowed and hallowed form, in the beloved disciple, we find in 2Jo 5:10; 3Jo 10.

fire ... as Elias--a plausible case, occurring also in Samaria (2Ki 1:10-12).