Rashi on Exodus 18:10/רש"י על שמות י״ח:י׳

1אשר הציל אתכם מיד מצרים WHO HATH DELIVERED YOU OUT OF THE HAND OF EGYPT, a hard people,

2ומיד פרעה AND OUT OF THE HAND OF PHARAOH, a hard monarch.

3מתחת יד מצרים — Translate this as the Targum does: from beneath the authority of Egypt, taking יד as an expression of domination and authority; “the hand” spoken of here is the hand which they imposed heavily upon them — referring to the hard bondage.