Exodus 10:15
For they covered the face of the whole earth, so that the land was darkened; and they did eat every herb of the land, and all the fruit of the trees which the hail had left: and there remained not any green thing in the trees, or in the herbs of the field, through all the land of Egypt.
Exodus 12:8
And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it.