He was speaking about Judas, the son of Simon Iscariot. For although Judas was one of the Twelve, he was later to betray Jesus.
Berean Standard Bible (BSB)
Now he spoke of Judas, the son of Simon Iscariot, for it was he who would betray him, being one of the twelve.
World English Bible (WEB)
{G1161} He spake{G3004}{(G5707)} of Judas{G2455} Iscariot{G2469} the son of Simon{G4613}: for{G1063} he{G3778} it was that should{G3195}{(G5707)} betray{G3860}{(G5721)} him{G846}, being{G5607}{(G5752)} one{G1520} of{G1537} the twelve{G1427}.
Strong's King James
(71) Now He meant Judas, of Simon Iscariot, for this one of the 12 would hand Him over.
The F.O.G
The F.O.G Message
And he spake of Judas, Simon’s son, Iscariot, for he was about to deliver him up, being one of the twelve.
Young's Literal Translation