Why do the nations rage – The Psalm is the second; and so we find it in all the more accurate books, that (these words) are the beginning of a Psalm. And in enumeration they inscribe it as the second. But some of our teachers have said (Bavli Berakhoth 9b) that Happy is and why do the nations rage form a single Psalm. And they have said (ibid. 10a) "Every section which was (specially) dear to David, he opened and closed with 'Happy is (are).' And this section he opened with 'Happy is the man,' and closed with 'Happy are all they that put their trust in Him.'" The reason why this Psalm follows immediately the other is not known to us; nor why he arranged them in the order in which they are connected, for they are not arranged in historical order. For instance, the third Psalm is concerned with the affair of Absalom, and after it occur many Psalms whose subject–matter is earlier by a considerable period than the incident of Absalom. Notice also, at the end of the book, Psalm 142, "When he was in the cave; a Prayer,⁠" (has reference to events) in the days of Saul. Therefore we cannot explain the arrangement of the Psalms according to the historical order. David composed and recited this Psalm in the opening of his reign, when the nations were gathered against him, as it is said (2 Sam. 5:17) "and when the Philistines heard that they had anointed David king over Israel all the Philistines went up to seek David.⁠" And this is his meaning in saying Why do they tumultuously assemble (רגשׁו)? because all the Philistines had come up. And רגשה has the sense of gathering and great multitude, as (Ps. 64:3), "from the throng (רגשתי) of the workers of iniquity;⁠" and the Targum of the passage (Ez. 30:10) "I will also make the multitude (המון) of Egypt cease,⁠" is, "and I will make of no avail the raging (איהרגושת) of Egypt.⁠"

And the peoples imagine a vain thing? – for when they came to make war they were saying proud things, because they had conquered Israel in the wars of Saul, and Saul and his sons were dead, and the people had been severely smitten. And from Saul's death until now there had not been another king for Israel. And he says, a vain thing is (the sum of) all their words.