New Revised Standard Version
Suddenly a spirit seizes him, and all at once he shrieks. It convulses him until he foams at the mouth; it mauls him and will scarcely leave him.

Contemporary English Version
A demon often attacks him and makes him scream. It shakes him until he foams at the mouth, and it won't leave him until it has completely worn the boy out.

New American Bible
For a spirit seizes him and he suddenly screams and it convulses him until he foams at the mouth; it releases him only with difficulty, wearing him out.

Douay-Rheims Bible
And lo, a spirit seizeth him, and he suddenly crieth out, and he throweth him down and teareth him, so that he foameth; and bruising him, he hardly departeth from him.

And lo, a spirit seizeth him, and he suddenly crieth out, and he throweth him down and teareth him, so that he foameth; and bruising him, he hardly departeth from him.

lo.

Luke 4:35 And Jesus rebuked him, saying: Hold thy peace and go out of him. And when the devil had thrown him into the midst, he went out of him and hurt him not at all.

Luke 8:29 For he commanded the unclean spirit to go out of the man. For many times it seized him: and he was bound with chains and kept in fetters: and breaking the bonds, he was driven by the devil into the deserts.

Mark 5:4,5 For having been often bound with fetters and chains, he had burst the chains, and broken the fetters in pieces, and no one could tame him. . . .

Mark 9:20,26 And they brought him. And when he had seen him, immediately the spirit troubled him and being thrown down upon the ground, he rolled about foaming. . . .

John 8:44 You are of your father the devil: and the desires of your father you will do. He was a murderer from the beginning: and he stood not in the truth, because truth is not in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father thereof.

1 Peter 5:8 Be sober and watch: because your adversary the devil, as a roaring lion, goeth about seeking whom he may devour.

Revelation 9:11 A king, the angel of the bottomless pit (whose name in Hebrew is Abaddon and in Greek Apollyon, in Latin Exterminans).