Luke
Luke 9:2ESV·traditional attribution

and he sent them out to proclaim the kingdom of God and to heal.

Matthew Henry Presbyterian @wholebiblehenry

We have here, I. The method Christ took to spread his gospel, to diffuse and enforce the light of it. He had himself travelled about, preaching and healing; but he could be only in one place at a time, and therefore now he sent his twelve disciples abroad, who by this time were pretty well instructed in the nature of the present dispensation, and able...

Commenting on Luke 9:1-9

John Gill Reformed Baptist @doctorgill

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...

Adam Clarke Methodist @methodicalclarke

To preach the kingdom of God - For an explication of this phrase, see on Mat 3:1 (note).