'Foul' in the Bible

The fish that are in the river shall die, and the river shall become foul; and the Egyptians shall loathe to drink water from the river."'"

The fish that were in the river died; and the river became foul, and the Egyptians couldn't drink water from the river; and the blood was throughout all the land of Egypt.

Notwithstanding they didn't listen to Moses, but some of them left of it until the morning, and it bred worms, and became foul: and Moses was angry with them.

They laid it up until the morning, as Moses asked, and it didn't become foul, neither was there any worm in it.