Judges 20:16

Out of all these people 700 choice men were left-handed; each one could sling a stone at a hair and not miss.

Judges 3:15

But when the sons of Israel cried to the Lord, the Lord raised up a deliverer for them, Ehud the son of Gera, the Benjamite, a left-handed man. And the sons of Israel sent tribute by him to Eglon the king of Moab.

1 Chronicles 12:2

They were equipped with bows, using both the right hand and the left to sling stones and to shoot arrows from the bow; they were Saul’s kinsmen from Benjamin.

1 Samuel 17:40

He took his stick in his hand and chose for himself five smooth stones from the brook, and put them in the shepherd’s bag which he had, even in his pouch, and his sling was in his hand; and he approached the Philistine.

1 Samuel 17:49-50

And David put his hand into his bag and took from it a stone and slung it, and struck the Philistine on his forehead. And the stone sank into his forehead, so that he fell on his face to the ground.

1 Samuel 25:29

Should anyone rise up to pursue you and to seek your life, then the life of my lord shall be bound in the bundle of the living with the Lord your God; but the lives of your enemies He will sling out as from the hollow of a sling.

2 Chronicles 26:14

Moreover, Uzziah prepared for all the army shields, spears, helmets, body armor, bows and sling 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 sons of Israel cried to the Lord, the Lord raised up a deliverer for them, Ehud the son of Gera, the Benjamite, a left-handed man. And the sons of Israel sent tribute by him to Eglon the king of Moab.
1 Chronicles 12:2
They were equipped with bows, using both the right hand and the left to sling stones and to shoot arrows from the bow; they were Saul’s kinsmen from Benjamin.

Sling stones

1 Samuel 17:40
He took his stick in his hand and chose for himself five smooth stones from the brook, and put them in the shepherd’s bag which he had, even in his pouch, and his sling was in his hand; and he approached the Philistine.
1 Samuel 25:29
Should anyone rise up to pursue you and to seek your life, then the life of my lord shall be bound in the bundle of the living with the Lord your God; but the lives of your enemies He will sling out as from the hollow of a sling.
2 Chronicles 26:14
Moreover, Uzziah prepared for all the army shields, spears, helmets, body armor, bows and sling stones.