Judges 20:16

Among all this people there were seven hundred chosen men left-handed; everyone could sling stones at a hair and not miss.

Judges 3:15

But when the children of Israel cried to the LORD, the LORD raised them up a savior, Ehud the son of Gera, the Benjamite, a man left-handed. The children of Israel sent tribute by him to Eglon the king of Moab.

1 Chronicles 12:2

They were armed with bows, and could use both the right hand and the left in slinging stones and in shooting arrows from the bow: they were of Saul's brothers of Benjamin.

1 Samuel 17:40

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

1 Samuel 17:49-50

David put his hand in his bag, took a stone, and slung it, and struck the Philistine in his forehead; and the stone sank into his forehead, and he fell on his face to the earth.

1 Samuel 25:29

Though men may rise up to pursue you, and to seek your soul, yet the soul of my lord shall be bound in the bundle of life with the LORD your God. He will sling out the souls of your enemies, as from the hollow of a sling.

2 Chronicles 26:14

Uzziah prepared for them, even for all the army, shields, and spears, and helmets, and coats of mail, and bows, and stones for slinging.

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 savior, Ehud the son of Gera, the Benjamite, a man left-handed. The children of Israel sent tribute by him to Eglon the king of Moab.
1 Chronicles 12:2
They were armed with bows, and could use both the right hand and the left in slinging stones and in shooting arrows from the bow: they were of Saul's brothers of Benjamin.

Sling stones

1 Samuel 17:40
He took his staff in his hand, and chose for himself five smooth stones out of the brook, and put them in the shepherd's bag which he had, even in his wallet. His sling was in his hand; and he drew near to the Philistine.
1 Samuel 25:29
Though men may rise up to pursue you, and to seek your soul, yet the soul of my lord shall be bound in the bundle of life with the LORD your God. He will sling out the souls of your enemies, as from the hollow of a sling.
2 Chronicles 26:14
Uzziah prepared for them, even for all the army, shields, and spears, and helmets, and coats of mail, and bows, and stones for slinging.