Albert Barnes Commentary Mark 1:15

"and saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe in the gospel." — Mark 1:15 (ASV)

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 Barnes on 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—that is, respecting salvation. See Barnes on Matthew 4:17.

repent ye (Acts 2:38); believe (Romans 16:26).