Luke 8:28

When he saw Jesus
Even afar off, at some considerable distance, he ran towards him, ( Mark 5:6 ) .

He cried out, and fell down before him;
that is, the man possessed with the devil did so, under his impulse, and through his agitation of him:

and with a loud voice said;
which was the unclean spirit in the man: what have I to do with thee, Jesus, thou Son of God, most high? I
beseech thee torment me not;
i.e. before the time; (See Gill on Matthew 8:29).