'Sand' in the Bible

And turning this way and that, and seeing no one, he put the Egyptian to death, covering his body with sand.

And the children of Israel said to them, It would have been better for the Lord to have put us to death in the land of Egypt, where we were seated by the flesh-pots and had bread enough for our needs; for you have taken us out to this waste of sand, to put all this people to death through need of food.