John Gill Commentary Luke 9:2

"And he sent them forth to preach the kingdom of God, and to heal the sick." — Luke 9:2 (ASV)

And he sent them to preach the kingdom of God
The Gospel, which gives an account of the kingdom of the Messiah; of his kingly office and power;

of his church, which is his kingdom, and of the government of it, by the ministration of the word, and the administration of ordinances;

of the kingdom of grace in the hearts of Christ's subjects, and the nature of it;

and of the kingdom of glory, and what is the saints' meetness for it, and right unto it:

and to heal the sick ;
of every disease of body, and thereby confirm their mission and commission from Christ, to preach the Gospel; and recommend it to men.