20 So the man went away and began to tell in the Decapolisa how much Jesus had done for him. And all the people were amazed.

Read Mark 5:20 Using Other Translations

And he departed, and began to publish in Decapolis how great things Jesus had done for him: and all men did marvel.
And he went away and began to proclaim in the Decapolis how much Jesus had done for him, and everyone marveled.
So the man started off to visit the Ten Towns of that region and began to proclaim the great things Jesus had done for him; and everyone was amazed at what he told them.