'Sand' in the Bible
That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies;
They filled in with sand all of the wells that Isaac's father Abraham's servants had dug during his lifetime.
Isaac re-excavated some wells that his father had first dug during his lifetime, because the Philistines had filled them with sand after Abraham's death. Isaac renamed those wells with the same names that his father had called them.
Your descendants shall be as [countless as] the dust of the earth, and you shall spread abroad to the west and the east and the north and the south; and all the families (nations) of the earth shall be blessed through you and your descendants.
And thou saidst, I will surely do thee good, and make thy seed as the sand of the sea, which cannot be numbered for multitude.