Rashi on Exodus 18:11/רש"י על שמות י״ח:י״א

1עתה ידעתי NOW I KNOW — I indeed knew Him formerly, but now I know Him even more (cf. Mekhilta).

2מכל האלהים [GREATER] THAN ALL THE GODS — This tells us that he had a full knowledge of every idol in the world — that he left no idol unworshipped by him (Mekhilta).

3כי בדבר אשר זדו עליהם — Understand this as the Targum does for by that very thing with which the Egyptians thought to judge Israel were they themselves judged — they had thought to destroy them by water and they were themselves destroyed by water (cf. Mekhilta).

4אשר זדו means in which they had shown themselves wicked. Our Rabbis, however, explained it in the same sense as the root which we find in (Genesis 25:29) “And Jacob was boiling (ויזד) pottage (נזיד) (lit., something boiled)” — in the pot wherein they had boiled, therein were they themselves boiled (Sotah 11a).