'Sand of the Sea' in the Bible

Their widows are increased to me above the sand of the seas: I have brought upon them against the mother of the young men a spoiler at noonday: I have caused him to fall upon it suddenly, and terrors upon the city.

As the host of heaven cannot be numbered, neither the sand of the sea measured: so will I multiply the seed of David my servant, and the Levites that minister unto me.