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).