John Gill Commentary Luke 8:39

"Return to thy house, and declare how great things God hath done for thee. And he went his way, publishing throughout the whole city how great things Jesus had done for him." — Luke 8:39 (ASV)

Return to your own house
Which very likely was in the city of Gadara, from where he went, and throughout the whole of which he published the account of the dispossession of the devils from him: Mark adds, "to your friends"; relations, acquaintance, and countrymen:

and show how great things God has done to you ;
for none but God could effect such things, tacitly suggesting to him hereby, that he himself was God. Mark adds, "and has had compassion on you": signifying, that what he had done for him, did not arise from merit in the man, but from mercy in himself; (See Gill on Mark 5:19).

And he went his way ;
he obeyed the orders of Christ, as love and gratitude obliged him:

and published throughout the whole city ;
of Gadara, and not only there, but in the rest of the ten cities, called Decapolis, (Mark 5:20) one of which was this of Gadara, as Pliny relates ^F15 :

how great things Jesus had done to him ;
having cast out a legion of devils from him, clothed him, and brought him to his right mind; and had not only delivered his body from a diabolical possession, but had given him spiritual and saving instructions for his soul, on which he had wrought a real work of grace.

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FOOTNOTES:

• F15: Lib. 5. c. 18.