He was referring to Judas, Simon Iscariot’s son, one of the Twelve, because he was going to betray Him.

Then one of His disciples, Judas Iscariot (who was about to betray Him), said,

Now by the time of supper, the Devil had already put it into the heart of Judas, Simon Iscariot’s son, to betray Him.

Jesus replied, “He’s the one I give the piece of bread to after I have dipped it.” When He had dipped the bread, He gave it to Judas, Simon Iscariot’s son.

After Judas ate the piece of bread, Satan entered him. Therefore Jesus told him, “What you’re doing, do quickly.”

Since Judas kept the money-bag, some thought that Jesus was telling him, “Buy what we need for the festival,” or that he should give something to the poor.

Judas (not Iscariot) said to Him, “Lord, how is it You’re going to reveal Yourself to us and not to the world?”

Judas, who betrayed Him, also knew the place, because Jesus often met there with His disciples.

So Judas took a company of soldiers and some temple police from the chief priests and the Pharisees and came there with lanterns, torches, and weapons.

“Jesus the Nazarene,” they answered.

“I am He,” Jesus told them.

Judas, who betrayed Him, was also standing with them.