Commentaries:
Barnes' Notes
The Lord hear thee in the day of trouble - According to the view expressed in the introduction to the psalm, this is the language of the people praying for their king, or expressing the hope that he would be delivered from trouble, and would be successful in what he had undertaken, in the prosecution of a war apparently of defense. The word" trouble" here used would seem to imply that he was beset with difficulties and dangers; perhaps, that he was surrounded by foes. It seems that he was going forth to war to deliver his country from trouble, having offered sacrifices and prayers Psalms 20:3 for the purpose of securing the divine favor on the expedition. The point or the moment of the psalm is when those sacrifices had been offered, and when he was about to embark on his enterprise. At that moment the people lift up the voice of sympathy and of encouragement, and pray that those sacrifices might be accepted, and that he might find the deliverance which he had desired.
The name of the God of Jacob - The word name is often put in the Scriptures for the person himself; and hence, this is equivalent to saying, "May the God of Jacob defend thee." See Psalms 5:11; Psalms 9:10; Psalms 44:5; Psalms 54:1; Exodus 23:21. Jacob was the one of the patriarchs from whom, after his other name, the Hebrew people derived their name Israel, and the word seems here to be used with reference to the people rather than to the ancestor. Compare Isaiah 44:2. The God of Jacob, or the God of Israel, would be synonymous terms, and either would denote that he was the Protector of the nation. As such he is invoked here; and the prayer is, that the Great Protector of the Hebrew people would now defend the king in the dangers which beset him, and in the enterprise which he had undertaken.
Defend thee - Margin, as in Hebrew, set thee on a high place. The word means the same as defend him, for the idea is that of being set on a high place, a tower, a mountain, a lofty rock, where his enemies could not reach or assail him.
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