John Gill Commentary Luke 9:6

"And they departed, and went throughout the villages, preaching the gospel, and healing everywhere." — Luke 9:6 (ASV)

And they departed
That is, the apostles, as the Syriac and Persic versions express it: they went from Christ, and the place where he was, from Capernaum, at least from some place in Galilee:

and went through the towns ;
the Syriac, Persic, and Ethiopic versions add, "and cities"; that is, of Judea, as well as Galilee, even the whole land of Israel:

preaching the Gospel ;
which explains what is meant by the kingdom of God, (Luke 9:2) and healing everywhere; all sorts of bodily diseases, wherever they came.