He shall drink of the brook in the way That is, says Houbigant, the brook Cedron, I suppose; David pointing out the passion of our Lord, by a continuance of the metaphor wherewith he began. Jesus was exalted because of his sufferings; therefore did he lift up his head, Hebrews 12:2. This is the more general interpretation of the verse. It expresses, says Poole, “the humiliation and passion of the Messiah, to prevent a great mistake which might arise in men's minds concerning him, from the great successes and victories here ascribed to him, which might induce them to think that he should be exempted from all sufferings, and be crowned with constant and perpetual triumphs. To confute this notion, he signifies here that the Messiah should have a large portion of afflictions while he was in the way or course of his life, before he should come to his end or rest, and to the honour of sitting at his Father's right hand.” Thus St. Paul, who may be considered as giving a comment on these words, observes, that being found in fashion as a man, he humbled himself, and became obedient unto death, wherefore God also hath highly exalted him, &c., Philippians 2:8-9. Waters in Scripture very frequently signify sufferings; and to drink of them signifies to feel or bear these sufferings. There are some, however, who give the verse a different meaning, and suppose that by drinking of the brook in the way, is meant the succour and supply of almighty grace: or, the influences of the Holy Spirit, frequently represented under the emblem of water, as Isaiah 12:3; Isaiah 55:1; John 7:38-39. Thus Mr. Hervey: “If it be asked, how the Redeemer shall be enabled to execute the various and important offices foretold in the former part of this Psalm, the prophet replies, He shall drink of the brook in the way. He shall not be left barely to his human nature, which must unavoidably sink, but through the whole administration of his mediatorial kingdom, and his incarnate state, shall be supported with omnipotent succours. He shall drink of the brook of almighty power: he shall be continually supported by the influence of the Holy Spirit, and therefore shall he lift up his head. By these means shall he be rendered equal to his prodigious task, superior to all opposition, successful in whatever he undertakes, and greatly triumphant over all his enemies.” Hervey's Med., vol. 1. p. 129.
Upon the whole, we have in this Psalm as clear a prophecy of the Messiah, and of the offices which he should sustain, as perhaps we can find, in so few words, in any part of the Old Testament, and a prophecy absolutely incapable of any other application. Now this prophecy was completely fulfilled in Jesus of Nazareth, when he rose from the dead, ascended into heaven, and sat down on the right hand of his Father; from thenceforth expecting till his enemies should be made his footstool; that is, “till Satan, the prince of this world, should be confined to the bottomless pit; till all the persecuting powers of it should be destroyed, and till death and the grave should be no more, Psalms 110:1. The kingdom, to which he was advanced, is a spiritual kingdom: the sceptre, with which he was presented in the heavenly Zion, is all power in heaven and earth; to be employed for the protection of his subjects, and the destruction of his enemies, Psalms 110:2. The laws of his kingdom are the laws of the gospel; which were to be published from Jerusalem: they who freely offered themselves to publish his laws, and gather subjects into his kingdom, were the apostles, and first preachers of his word; who, in a few years, being invested with power from on high, spread his gospel over the world, and gathered into his kingdom multitudes of subjects out of every nation under heaven, Psalms 110:3. At the same time that Jesus was seated on his throne as King, he was made High-Priest in the heavenly sanctuary, to intercede for his people, and be their advocate with the Father, Psalms 110:4. The sceptre was given him as well for the destruction of his enemies, as the protection of his subjects. When, therefore, the potentates of the earth opposed his gospel, and persecuted its publishers, he destroyed them with the breath of his mouth; first, by pouring out his wrath on Judea, in the excision of its inhabitants, and the subversion of its state; and afterward, by executing his vengeance on the persecuting powers of the heathen world, as they rose up to oppose the advancement of his kingdom, Psalms 110:5-6; Revelation 19:11-21. When Jesus set out on his warfare against the enemies of our salvation, he drank deep of the cup of sorrow and suffering; but, in reward for his humiliation, he is highly exalted to the throne of equal glory, at the right hand of God, that all should honour the Son, even as they honour the Father:” see Green, on the Prayer of Habakkuk.