Mark 1:9

We have here a brief account of Christ's baptism and temptation, which were largely related Mt. 3 and 4. I. His baptism, which was his first public appearance, after he had long lived obscurely in Nazareth. O how much hidden worth is there, which in this world is either lost in the dust of contempt and cannot be known, or wrapped up in the veil of humility and will not be known! But sooner or later it shall be known, as Christ's was. 1. See how humbly he owned God, by coming to be baptized of John; and thus it became him to fulfil all righteousness. Thus he took upon him the likeness of sinful flesh, that, though he was perfectly pure and unspotted, yet he was washed as if he had been polluted; and thus for our sakes he sanctified himself, that we also might be sanctified, and be baptized with him, Joh 17:19. 2. See how honourably God owned him, when he submitted to John's baptism. Those who justify God, and they are said to do, who were baptized with the baptism of John, he will glorify, Luk 7:29, Luk 7:30. (1.) He saw the heavens opened; thus he was owned to be the Lord from heaven, and had a glimpse of the glory and joy that were set before him, and secured to him, as the recompence of his undertaking. Matthew saith, The heavens were opened to him. Mark saith, He saw them opened.

— Matthew Henry's Concise Commentary (public domain)