'Sand' in the Bible

Everyone who hears these words of Mine and does not act on them, will be like a foolish man who built his house on the sand.

Isaiah cries out concerning Israel, “Though the number of the sons of Israel be like the sand of the sea, it is the remnant that will be saved;

Therefore there was born even of one man, and him as good as dead at that, as many descendants as the stars of heaven in number, and innumerable as the sand which is by the seashore.

And the dragon stood on the sand of the seashore.Then I saw a beast coming up out of the sea, having ten horns and seven heads, and on his horns were ten diadems, and on his heads were blasphemous names.

and will come out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together for the war; the number of them is like the sand of the seashore.