'Sand' in the Bible

Fear ye not me? saith Jehovah: will ye not tremble at my presence, who have placed the sand for the bound of the sea, by a perpetual decree, that it cannot pass it? and though the waves thereof toss themselves, yet can they not prevail; though they roar, yet can they not pass over it.

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 destroyer at noonday: I have caused anguish and terrors to fall upon her suddenly.

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.