'Sand of the Sea' in the Bible

Their widows are increased to me more than the sand of the seas; I have brought upon them, against the mother of the young men, a spoiler at noonday; I have caused anguish and terror to fall upon her suddenly.

As the host of the heavens cannot be numbered, nor the sand of the sea measured, so will I multiply the seed of David my servant, and the Levites that minister unto me.