God does the saving and keeps those He saves.
John 10:27-28, My sheep hear my voice, and I know them, and they follow me: And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand. . . .
“See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God. 13 But encourage one another daily, as long as it is called “Today,” so that none of you may be hardened by sin’s deceitfulness. 14 We have come to share in Christ, if indeed we hold our original conviction firmly to the very end “ Hebrews 3:12
It’s not that sheep are plucked away by anyone, the sheep can wander off of their own accord, they no longer hear His voice, then they are no longer Christ’s sheep.
Christ’s sheep hear His voice.