A.T. Robertson Commentary John 17:15

"I pray not that thou shouldest take them from the world, but that thou shouldest keep them from the evil [one]." — John 17:15 (ASV)

Shouldest take (αρηις). First aorist active subjunctive of αιρω (liquid verb).

From the evil one (εκ του πονηρου). Ablative case with εκ, but can mean the evil man, Satan, or the evil deed. See same ambiguity in Mt 6:13. But in 1 John 5:18 ο πονηρος is masculine (the evil one). Cf. Revelation 3:10.