Sforno on Exodus 18:11/ספורנו על שמות י״ח:י״א

1כי בדבר אשר זדו עליהם. G’d saved the people by using the very means the Egyptians had used to harm them to harm their oppressors. The word זדו, past tense, occurs as future tense, יזיד in Exodus 21,14 describing the deliberate commission of a crime, a sin. The sin Yitro had in mind was that G’d had killed the Egyptian firstborn as a retribution for the male babies of the Jewish people having been thrown into the river to drown. (Exodus 1,22). The Egyptians died by drowning just as their victims the Jewish babies had died by drowning. Yitro recognised that the ability to make the punishment fit the crime is what put our G’d in a class all by Himself, unparalleled in any other religion. None of G’d’s agents in the celestial spheres, even, would be able to do this.