I will say unto God my rock - I will appeal to God as my defense, my helper, my Saviour. On the word rock, as applied to God, see the notes at Psalm 18:2.

Why hast thou forgotten me? - See the notes at Psalm 22:1. He had seemed to forget and forsake him, for He did not come to interpose and save him. This is a part of the prayer which he says Psalm 42:8 that he would use.

Why go I mourning? - On the meaning of the word used here - קדר qodēr - see Psalm 35:14, note; Psalm 38:6, note. The idea is that of being bowed down, made sad, deeply afflicted, as one forsaken.

Because of the oppression of the enemy - In the oppression of the enemy; that is, during its continuance, or on account of it. The word here rendered "oppression" means distress, affliction, straits, Job 36:15; 1 Kings 22:27; Isaiah 30:20. The "enemy" here referred to may have been Absalom, who had driven him from his throne and kingdom.

I will say unto God my rock - God, my Fortress and Support.

Why hast thou forgotten me? - This and the following verse is badly pointed in our Bibles: "Why go I mourning as with a sword in my bones because of the oppression of the enemy? Mine enemies reproach me daily, while they say unto me, Where is thy God?" See on Psalm 42:3 (note). Their reproaches are to my soul as cutting and severe as a sword thrust into my body, and separating between my bones; because these reproaches are intended to fall on thee, my God, as if thou hadst not power to save us from the hands of our oppressors.

I will say unto God my rock,.... A name frequently given to the eternal God, Father, Son, and Spirit, Deuteronomy 32:4; See Gill on Psalm 18:2;

why hast thou forgotten me? See Gill on Psalm 13:1;

why go I mourning because of the oppression of the enemy? meaning perhaps Saul; though it may be applied to any spiritual enemy, sin, Satan, and the world; who are very oppressive and afflicting, and occasion continual mourning to the children of God.

I will say unto God my rock, Why hast thou forgotten me? why go I mourning because of the oppression of the enemy?

9, 10. in view of which [Ps 42:8], he dictates to himself a prayer based on his distress, aggravated as it was by the cruel taunts and infidel suggestions of his foes.

42:6-11 The way to forget our miseries, is to remember the God of our mercies. David saw troubles coming from God's wrath, and that discouraged him. But if one trouble follow hard after another, if all seem to combine for our ruin, let us remember they are all appointed and overruled by the Lord. David regards the Divine favour as the fountain of all the good he looked for. In the Saviour's name let us hope and pray. One word from him will calm every storm, and turn midnight darkness into the light of noon, the bitterest complaints into joyful praises. Our believing expectation of mercy must quicken our prayers for it. At length, is faith came off conqueror, by encouraging him to trust in the name of the Lord, and to stay himself upon his God. He adds, And my God; this thought enabled him to triumph over all his griefs and fears. Let us never think that the God of our life, and the Rock of our salvation, has forgotten us, if we have made his mercy, truth, and power, our refuge. Thus the psalmist strove against his despondency: at last his faith and hope obtained the victory. Let us learn to check all unbelieving doubts and fears. Apply the promise first to ourselves, and then plead it to God.