William Burkitt on Matthew 10:7

Observe here, 1. The duty enjoined the apostles in order to the bringing home of lost souls to Christ, and that is, preaching; As ye go, preach.

Note thence, That the plain and persuasive preaching of the gospel, is the special mean appointed by Christ for the salvation of lost sinners.

Observe, 2. The doctrine they are enjoined to preach, namely, that the kingdom of heaven is at hand; that is, that the promised Messiah was come, and had set up his kindom in the world, and expected their obedience to his laws.

Where note, How that the preaching of John, of Christ, and his apostles, was one and the same; namely, the doctrine of repentance: repent, say they all, for the kingdom of heaven is at hand; that is, the time of the Messiah's appearing, which has been so long expected, is now come.