4 John came, and gave baptism in the waste land, preaching baptism as a sign of forgiveness of sin for those whose hearts were changed. 5 And there went out to him all the people of Judaea, and all those of Jerusalem, and they were given baptism by him in the river Jordan, saying that they were sinners. 6 And John was clothed in camel's hair, with a leather band about him; and his food was locusts and honey.
Matthew Henry's Commentary on Mark 1:4-6
Commentary on Mark 1:1-8
(Read Mark 1:1-8)
Isaiah and Malachi each spake concerning the beginning of the gospel of Jesus Christ, in the ministry of John. From these prophets we may observe, that Christ, in his gospel, comes among us, bringing with him a treasure of grace, and a sceptre of government. Such is the corruption of the world, that there is great opposition to his progress. When God sent his Son into the world, he took care, and when he sends him into the heart, he takes care, to prepare his way before him. John thinks himself unworthy of the meanest office about Christ. The most eminent saints have always been the most humble. They feel their need of Christ's atoning blood and sanctifying Spirit, more than others. The great promise Christ makes in his gospel to those who have repented, and have had their sins forgiven them, is, they shall be baptized with the Holy Ghost; shall be purified by his graces, and refreshed by his comforts. We use the ordinances, word, and sacraments without profit and comfort, for the most part, because we have not of that Divine light within us; and we have it not because we ask it not; for we have his word that cannot fail, that our heavenly Father will give this light, his Holy Spirit, to those that ask it.