'Sand' in the Bible

And everyone who hears these words of Mine and does not do them, will be like a foolish (stupid) man who built his house on the sand.

And Isaiah calls out concerning Israel: “Though the number of the sons of Israel be like the sand of the sea, it is only the remnant [a small believing minority] that will be saved [from God’s judgment];

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