Awake up, my glory - By the word “glory” here some understand the tongue; others understand the soul itself, as the glory of man. The “word” properly refers to that which is weighty, or important; then, anything valuable, splendid, magnificent. Here it seems to refer to all that David regarded as glorious and honorable in himself - his noblest powers of soul - all in him that “could” be employed in the praise of God. The occasion was one on which it was proper to call all his powers into exercise; all that was noble in him as a man. The words “awake up” are equivalent to “arouse;” a solemn appeal to put forth all the powers of the soul.
Awake, psaltery and harp - In regard to these instruments, see the notes at Isaiah 5:12. The instrument denoted by the word “psaltery” - נבל nebel - was a stringed instrument, usually with twelve strings, and played with the fingers. See the notes at Psalms 33:2. The “harp” or “lyre” - כנור kinnôr - was also a stringed instrument, usually consisting of ten strings. Josephus says that it was struck or played with a key. From 1 Samuel 16:23; 1Sa 18:10; 1 Samuel 19:9, it appears, however, that it was sometimes played with the fingers.
I myself will awake early - That is, I will awake early in the morning to praise God; I will arouse myself from slumber to do this; I will devote the first moments - the early morning - to his worship. These words do not imply that this was an evening psalm, and that he would awake on the morrow - the next day - to praise God; but they refer to what he intended should be his general habit - that he would devote the early morning (arousing himself for that purpose) to the praise of God. No time in the day is more appropriate for worship than the early morning; no object is more worthy to rouse us from our slumbers than a desire to praise God; in no way can the day be more appropriately begun than by prayer and praise; and nothing will conduce more to keep up the flame of piety - the life of religion in the soul - than the habit of devoting the early morning to the worship of God; to prayer; to meditation; to praise.