Judges 20:16

Among all this people there were seven hundred chosen men left-handed; every one could sling stones to a hair-breadth, and not miss.

Judges 3:15

But when the children of Israel cried to the LORD, the LORD raised them up a deliverer, Ehud the son of Gera, a Benjaminite, a man left-handed: and by him the children of Israel sent a present to Eglon king of Moab.

1 Chronicles 12:2

They were armed with bows, and could use both the right hand and the left in hurling stones, and shooting arrows from a bow, even of Saul's brethren of Benjamin.

1 Samuel 17:40

And he took his staff in his hand, and chose him five smooth stones out of the brook, and put them in a shepherd's bag which he had, even in a scrip; and his sling was in his hand; and he drew near to the Philistine.

1 Samuel 17:49-50

And David put his hand in his bag, and took thence a stone, and hurled it with his sling, and smote the Philistine in his forehead, that the stone sunk into his forehead; and he fell upon his face to the earth.

1 Samuel 25:29

Yet a man hath risen to pursue thee, and to seek thy soul: but the soul of my lord shall be bound in the bundle of life with the LORD thy God; and the souls of thy enemies, them shall he sling out, as from the middle of a sling.

2 Chronicles 26:14

And Uzziah prepared for them throughout all the army, shields, and spears, and helmets, and habergeons, and bows, and slings to cast stones.

Treasury of Scripture Knowledge

Summary

Among all this people there were seven hundred chosen men lefthanded; every one could sling stones at an hair breadth, and not miss.

Bible References

Left-handed

Judges 3:15
But when the children of Israel cried to the LORD, the LORD raised them up a deliverer, Ehud the son of Gera, a Benjaminite, a man left-handed: and by him the children of Israel sent a present to Eglon king of Moab.
1 Chronicles 12:2
They were armed with bows, and could use both the right hand and the left in hurling stones, and shooting arrows from a bow, even of Saul's brethren of Benjamin.

Sling stones

1 Samuel 17:40
And he took his staff in his hand, and chose him five smooth stones out of the brook, and put them in a shepherd's bag which he had, even in a scrip; and his sling was in his hand; and he drew near to the Philistine.
1 Samuel 25:29
Yet a man hath risen to pursue thee, and to seek thy soul: but the soul of my lord shall be bound in the bundle of life with the LORD thy God; and the souls of thy enemies, them shall he sling out, as from the middle of a sling.
2 Chronicles 26:14
And Uzziah prepared for them throughout all the army, shields, and spears, and helmets, and habergeons, and bows, and slings to cast stones.