The question that is put forth, is, 'In what sense Satan entered into Judas? The Greek has it: "Eiselthen de Satanas eis Ioudan. Although the Greek word used here could and has been in reference to demon possession it is likely meant here in a figurative sense. "At this time “Satan entered into Judas,” likely in the sense that the traitorous apostle gave himself in to the will of the Devil, allowing himself to be a tool to carry out Satan’s design to stop Christ." Insight Vol 2 pq. 130
A Translator's Handbook On The Gospel of Luke states: "Exegesis: eiselthen de Satanas eis Ioudan 'then Satan entered into Judas',i.e. 'took possession of J.' elsewhere in the sense of demon possession but here in a somewhat weaker sense, since Judas does not henceforth appear as a demoniac who is not acting of his own will." pg. 681
Also note John 13.2: "So, while the evening meal was going on, the Devil having already put it into the heart of Judas Iscariot....... Thus indicating it was not possession but he 'entered into him' in a figurative sense. Into his heart. Also note 13.27 where the same Greek expression occurs.
J.M.Creed who wrote: The Gospel of Luke The Greek Text with Introduction, Notes, and Induces said concerning the Lukan text: "The prince of evil, who had been foiled in his previous attempts upon the Son of God, now makes Judas his instrument to compass his death." pg 260
