Mark 1:15

(15) The time is fulfilled.—The words are not found in the parallel passages of the other Gospels, and are interesting as embodying the same thought as St. Paul’s “in the fulness of time” (Galatians 4:4; Ephesians 1:10). So, too, St. Mark adds “believe the gospel” to the simple “repent” of St. Matthew, and gives “the kingdom of God” instead of “the kingdom of heaven.”