67 Grk “he”; the referent (Judas) has been specified in the translation for clarity.
68 Grk “into that one”; the pronoun “he” is more natural English style here. This is the only time in the Fourth Gospel that Satan is mentioned by name. Luke 22:3 uses the same terminology of Satan “entering into” Judas but indicates it happened before the last supper at the time Judas made his deal with the authorities. This is not necessarily irreconcilable with John’s account, however, because John 13:2 makes it clear that Judas had already come under satanic influence prior to the meal itself. The statement here is probably meant to indicate that Judas at this point came under the influence of Satan even more completely and finally. It marks the end of a process which, as Luke indicates, had begun earlier.
69 Grk “Then Jesus said to him.”

In other versions

Then after he had taken the morsel, Satan entered into him. Jesus said to him, “What you are going to do, do quickly.”

As soon as Judas took the bread, Satan entered into him.

So Jesus told him, “What you are about to do, do quickly.”

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

When Judas had eaten the bread, Satan entered into him. Then Jesus told him, “Hurry and do what you’re going to do.”

And after the piece of bread, then Satan entered into him. Then Jesus said to him, “What you are doing, do quickly!”

And after the sop Satan entered into him. Then said Jesus unto him, That thou doest, do quickly.

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