Psalms 57:8

“Hence--he addresses his glory, or tongue (Psa 16:9; Psa 30:12), and his psaltery, or lute, and harp. I myself . . . early--literally, "I will awaken dawn," poetically expressing his zeal and diligence.”

“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…”

“My glory - My tongue, the instrument of singing. Awake - I will employ all the powers of my soul and body. Psalms 57:9”

“Awake: Jdg 5:12; Isa 52:1, Isa 52:9 my glory: Psa 16:9, Psa 30:12, Psa 108:1-3; Act 2:26 I myself will awake early: Literally,"I will awaken the morning," or dawn; a highly poetical expression, which Milton and others have borrowed: - Cheerly rouse the slumbering morn. Psalms 57:9”