23 I say then of these crooked and embittering persons, “How often they exasperated Him in the desert, and provoked Him to wrath in the waterless place!”. “And they turned themselves and tempted God, and exasperated the Holy One of Israel”. He is repeating that same unbelief of theirs, of which He had made mention above. But the reason of the repetition is, in order that there may be mentioned also the plagues which He inflicted on the Egyptians for their sakes: all which things they certainly ought to have remembered, and not to be ungrateful.
Lastly, there follows what? “They remembered not His hands, in the day when He redeemed them from the hand of the troubler”. And he begins to speak of what things He did to the Egyptians: “He set in Egypt His signs, and His prodigies in the plain of Thanis”: “and He turned their rivers into blood, and their showers lest they should drink”, or rather, “the flowings of waters,” as some do better understand by what is written in Greek, τὰ ὀμβρήματα, which in Latin we call scaturigines, waters bubbling from beneath.
“He sent upon them the dog-fly, and it ate them up; and the frog, and it destroyed them”. “And He gave their fruit to the mildew, and their labours to the locust”. “And He slew with hail their vineyards, and their mulberry trees with frost”. “And He gave over to the hail their beasts of burden, and their possessions to the fire”. “He sent upon them the anger of His indignation, indignation and anger and tribulation, a visitation through evil angels”. He made a way to the course of His anger, and their beasts of burden He shut up in death. “And He smote every first-born thing in the land of Egypt, the first-fruits of their labours in the tabernacles of Cham”.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)