'Sand of the Sea' in the Bible

Their widows are increased to me above the sand of the seas; I have brought on them against the mother of the young men a destroyer at noonday: I have caused anguish and terrors to fall on her suddenly.

As the army of the sky can't be numbered, neither the sand of the sea measured; so will I multiply the seed of David my servant, and the Levites who minister to me.