Moses and Aaron acted as God's chosen messengers to strike Egypt with plagues that served as both stern warnings and crushing punishments. By bringing these disasters upon a nation widely considered the world center of sorcery, God demonstrated His absolute control. The miracles delivered by Moses and Aaron belonged entirely to God [אבן עזרא]. They were not brought about by physical force, but rather by the sheer power of divine speech. Just as the world was originally created through ten spoken commands, God's speech actively formed the plagues. This explains why God brought exactly ten plagues upon the Egyptians. Even though He could have easily freed the Israelites with fewer, He chose to complete a full, deliberate system of miracles, the acronyms of which were engraved directly on the staff [אלשיך].
Within this system, a fundamental distinction exists between the different types of miracles. Some acted as signs, which were preceded by clear warnings and intended to deliver a specific message. Others functioned as wonders, striking without any prior notice. Plagues such as lice, boils, and darkness fall into this latter category, and their purpose was purely punitive [מלבי״ם].
The specific location of these events, the land of Egypt, carried a dual significance. First, performing such extraordinary acts in the ultimate stronghold of magic proved beyond any doubt that they were genuine divine actions rather than clever illusions. The Egyptian sorcerers were entirely powerless against this force, a reality made obvious when Aaron's staff swallowed their staffs, causing them to vanish completely [אלשיך]. Second, the goal in this land was never to teach the Egyptians the principles of faith, but rather to punish them severely for their crimes [מלבי״ם].
When recounting these events, the psalm only mentions a portion of the plagues, and they do not follow the familiar chronological order found in the Torah. This is because the poet wrote through prophetic inspiration rather than attempting to compile a strict historical record. He presented a general reflection on the miracles, relying on the fact that the complete and detailed account was already well known to his audience [מאירי].