Why did David pick up five stones?

What the text says

Saul has just dressed David in his own armor, and David has taken it off again: “I can’t go with these, for I have not tested them” (17:39). What he takes instead is a shepherd’s kit.

He took his staff in his hand, and chose for himself five smooth stones out of the brook, and put them in the pouch of his shepherd’s bag which he had. His sling was in his hand; and he came near to the Philistine.

That is the only time the number appears. The Hebrew word for the brook, nahal, is a stream bed that runs with water in the rainy season and often lies dry in summer, where the current has already rounded the stones. Then the text moves on and never mentions the other four again. The victory takes one: “David prevailed over the Philistine with a sling and with a stone” (17:50).

A shepherd’s weapon, and a soldier’s

A sling is not a slingshot. It has no fork and no rubber band, just two cords and a pouch. The slinger whirls it, lets one cord go, and the stone flies. Shepherds used slings to drive off predators and to turn a straying sheep. Armies used them too. The Bible remembers seven hundred left-handed slingers of Benjamin, each of whom “could sling a stone at a hair and not miss” (Judges 20:16), and warriors who joined David and could sling with either hand (1 Chronicles 12:2). King Uzziah stocked “stones for slinging” for his army (2 Chronicles 26:14), and the Assyrian reliefs of the siege of Lachish in 701 BC, now in the British Museum, show slingers in action.

Smooth stones matter. A round stone flies straight and true, where a jagged one wobbles. Malcolm Gladwell built part of his book David and Goliath (2013) on this point: a skilled slinger facing a slow, heavy infantryman was not much of an underdog.

Why five? The explanations

Since 1 Samuel gives no reason, readers have supplied their own.

• Spare shots. The simplest reading. A stone can miss, and Goliath had a shield-bearer walking in front of him (17:41). Five in the bag meant David could keep shooting.
• Goliath’s kin. A popular explanation points to 2 Samuel 21:15–22, where four more Philistine champions “born to the giant in Gath” fall to David and his men. On this view David took one stone for Goliath and four for his family. The text never makes that link, and those four died years later, by other hands.
• Symbols. Sermons have made the five stones into the five books of Moses or five virtues of faith. The text offers no such key.

The four giants of Gath

The list in 2 Samuel 21 holds surprises of its own. Abishai kills Ishbibenob, who nearly kills an exhausted David. Sibbecai kills Saph. Jonathan, David’s nephew, kills a giant with six fingers on each hand and six toes on each foot. And Elhanan of Bethlehem kills Goliath’s brother, the one whose spear shaft was “like a weaver’s beam” (2 Samuel 21:19); 1 Chronicles 20:5 names him Lahmi. In the Hebrew of 2 Samuel, though, Elhanan kills Goliath the Gittite himself, a puzzle scholars still argue over.

Whatever the four mean, the five stones help the duel ring true: a young man who comes prepared, then needs a fifth of what he brought. As David tells Goliath, “the battle is Yahweh’s” (17:47). For the size of the man he faced, see how tall Goliath was, and for David’s own age, how old David was.