[U] The word translated "power" in our version, has the same double meaning as that has in old English, or as "force" has now, sometimes signifying "strength" and sometimes an "army." The latter is the more appropriate here. "The day of Thine army" will then be equivalent to the day of mustering the troops.
Another solemn word from the lips of God begins the second half of the psalm. "Jehovah swears," gives the sanction and guarantee of His own nature, puts in pledge His own being for the fulfilment of the promise. And that which He swears is a new thing in the earth. The blending of the royal and priestly offices in the Messiah, and the eternal duration in Him of both, is a distinct advancement in the development of Messianic prophecy. The historical occasion for it may indeed be connected with David's kingship and conquest of Melchizedek's city; but the real source of it is a direct predictive inspiration. We have here not merely the devout psalmist meditating on the truths revealed before his day, but the prophet receiving a new word from God unheard by mortal ears, and far transcending even the promises made to him by Nathan. There is but one person to whom it can apply, who sits as a priest upon his throne, who builds the temple of the Lord (Zech. vi. 12, 13).
As the former Divine word, so this is followed by the prophet's rapturous answer, which carries on the portraiture of the priest-king. There is some doubt as to the person addressed in these later verses. "The Lord at thy right hand crushes kings in the day of His wrath." Whose right hand? The answer generally given is, "The Messiah's." Who is the Lord that smites the petty kinglets of earth? The answer generally given is, "God." But it is far more dramatic, avoids an awkward abruptness in the change of persons in the last verse, and brings out a striking contrast with the previous half, if we take the opposite view, and suppose Jehovah addressed and the Messiah spoken of throughout. Then the first Divine word is followed by the prophetic invocation of the exalted Messiah throned at the right hand and expecting till His enemies be made His footstool. The second is followed by the prophetic invocation of Jehovah, and describes the Lord Messiah at God's right hand as before, but instead of longer waiting He now flames forth in all the resistless energy of a conqueror. The day of His array is succeeded by the day of His wrath. He crushes earth's monarchies. The psalmist's eye sees the whole earth one great battle-field. "(It is) full of corpses. He wounds the head over wide lands," where there may possibly be a reference to the first vague dawning of a hope which God's mercy had let lighten on man's horizon--"He shall bruise thy head," or the word may be used as a collective expression for rulers, as the parallelism with the previous verse requires. Thus striding on to victory across the prostrate foe, and pursuing the flying relics of their power, "He drinks of the brook in the way, therefore shall He lift up the head," words which are somewhat difficult, however interpreted. If, with the majority of modern commentators, we take them as a picturesque embodiment of eager haste in the pursuit, the conqueror "faint, yet pursuing," and stooping for a moment to drink, then hurrying on with renewed strength after the fugitives, one can scarcely help feeling that such a close to such a psalm is trivial and liker the artificial play of fancy than the work of the prophetic spirit, to say nothing of the fact that there is nothing about pursuit in the psalm. If we fall back on the older interpretation, which sees in the words a prophecy of the sufferings of the Messiah who tastes death and drinks of the cup of sorrows, and therefore is highly exalted, we get a meaning which worthily crowns the psalm, but seems to break somewhat abruptly the sequence of thought, and to force the metaphor of drinking of the brook into somewhat strained parallelism with the very different New Testament images just named. But the doubt we must leave over these final words does not diminish the preciousness of this psalm as a clear, articulate prophecy from David's lips of David's Son, whom he had learned to know through the experiences and facts of his own life. He had climbed through sufferings to his throne. God had exalted him and given him victory, and surrounded him with a loyal people. But he was only a shadow; limitations and imperfections surrounded his office and weakened himself; half of the Divine counsel of peace could not be mirrored in his functions at all, and death lay ahead of him. So his glory and his feebleness alike taught him that "one mightier than" he must be coming behind him, "the latchet of whose shoes he was not worthy to unloose"--the true King of Israel, to bear witness to whom was his highest honour.