'Sand' in the Bible

"You should fear me!" says the Lord. "You should tremble in awe before me! I made the sand to be a boundary for the sea, a permanent barrier that it can never cross. Its waves may roll, but they can never prevail. They may roar, but they can never cross beyond that boundary."

Their widows will become in my sight more numerous than the grains of sand on the seashores. At noontime I will bring a destroyer against the mothers of their young men. I will cause anguish and terror to fall suddenly upon them.