Mark 5:19

17 And the people began to beg Jesus to leave their region.

18 As He was getting into the boat, the man who had been possessed by the demons begged to go with Him.

But Jesus would not allow him. “Go home to your own people,” He said, “and tell them how much the Lord has done for you, and what mercy He has shown you.”

20 So the man went away and began to proclaim throughout the Decapolis how much Jesus had done for him. And everyone was amazed.

21 When Jesus had again crossed by boat to the other side, a large crowd gathered around Him beside the sea.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
But Jesus would not allow him. “Go home to your own people,” He said, “and tell them how much the Lord has done for you, and what mercy He has shown you.”
KJV
Howbeit Jesus suffered him not, but saith unto him, Go home to thy friends, and tell them how great things the Lord hath done for thee, and hath had compassion on thee.
WEB
He didn’t allow him, but said to him, “Go to your house, to your friends, and tell them what great things the Lord has done for you and how he had mercy on you.”
ASV
And he suffered him not, but saith unto him, Go to thy house unto thy friends, and tell them how great things the Lord hath done for thee, and [how] he had mercy on thee.
DARBY
And he suffered him not, but says to him, Go to thine home to thine own people, and tell them how great things the Lord has done for thee, and has had mercy on thee.
BLB
And He did not permit him, but He says to him, “Go to your house, to your⁺ own, and report to them how much the Lord has done for you, and [how] He had mercy on you.”
ÅB
Og han gav ham ikke lov, men sa til ham: Gå hjem til dine og fortell dem hvor store ting Herren har gjort imot deg, og at han har miskunnet seg over deg!
OTB
Jesus lot ham ikke, men sa: «Gå hjem til ditt eget folk og fortell dem hvilke store ting Herren har gjort for deg, og hvordan Han har vist deg barmhjertighet.»
B1930
Og han gav ham ikke lov, men sa til ham: Gå hjem til dine og fortell dem hvor store ting Herren har gjort imot dig, og at han har miskunnet sig over dig!

Study notes (Tyndale)

Original text and word study

Cross references