The time is fulfilled - That is, the time for the appearance of the Messiah, the time so long foretold, has come. "The kingdom of God is at hand." See the notes at Matthew 3:2.
Repent ye - Exercise sorrow for sins, and turn from them.
And believe the gospel - Literally, trust in the gospel, or believe the good tidings - to wit, respecting salvation. See the notes at Matthew 4:17.

The time is fulfilled - That is, the time appointed for sending the Messiah; and particularly the time specified by Daniel, Daniel 9:24-27. Here are four points worthy of deep attention, in the preaching of the Son of God.
1. Every thing that is done is according to a plan laid by the Divine wisdom, and never performed till the time appointed was filled up.
2. That the kingdom and reign of sin are to be destroyed, and the kingdom of grace and heaven established in their place.
3. That the kingdom of God, and his reign by grace, begins with repentance for past sins.
4. That this reign of grace is at hand; and that nothing but an obstinate perseverance in sin and impenitence can keep any soul out of it; and that now is the accepted time to enter in.

And saying, the time is fulfilled,.... Either that which was fixed for the end of the law and prophets, the legal and Mosaic dispensation, and the Jewish church state; or the fulness of time for the Messiah's appearance in the world; which was agreed upon between the Father and the Son, was predicted in various prophecies, and the people of the Jews were in a general expectation of:
and the kingdom of God is at hand: the same with the kingdom of heaven, in Matthew 3:2, see the notes: See Gill on Matthew 3:2, Matthew 4:17.
repent ye, and believe the Gospel. He called them to repent, not only of their former sins and vicious course of life, but of their bad principles and tenets, concerning a temporal kingdom of the Messiah; concerning merit and free will, justification by the works of the law, and salvation by their obedience to the ceremonies of it, and the traditions of the elders: these he exhorts them to change their sentiments about, and to relinquish them, and give into the Gospel scheme; which proclaims liberty from the law, peace, pardon, and righteousness by Christ, and salvation and eternal life by the free grace of God.

The time is fulfilled - The time of my kingdom, foretold by Daniel, expected by you, is fully come.