John Mark
Mark 5:20ESV·traditional attribution

And he went away and began to proclaim in the Decapolis how much Jesus had done for him, and everyone marveled.

Matthew Henry Presbyterian @wholebiblehenry

We have here an instance of Christ's dispossessing the strong man armed, and disposing of him as he pleased, to make it appear that he was stronger than he. This he did when he was come to the other side, whither he went through a storm; his business there was to rescue this poor creature out of the hands of Satan, and when he had done that, he returned.

Commenting on Mark 5:1-20

John Gill Reformed Baptist @doctorgill

And he departed, and began to publish in Decapolis,.... He submitted to the will of Christ, though he could gladly have gone with him; he hearkened to his instructions, took his advice, and obeyed his commands, as every one that has received favours from him ought to do and he went not only to his own, or his father's house, and acquainted his nearest friends...

Albert Barnes Presbyterian @notesbybarnes

Verse 20. In Decapolis. . How great things, etc. This was the natural expression of right feeling at being cured of such a calamity. So the desire of sinners freed from sin is to honour Jesus; to ascribe all to his power; and to invite the world to participate in the same salvation, and to join them in doing honour to the Son of God. Compare .