Judges 20:16

Besides these, the citizens of Gibeah gathered seven hundred specially chosen men who were left-handed. Every one of them could sling a stone at a strand of hair and never miss.

Judges 3:15

Then the Israelites cried out to Jehovah. So he sent someone to free them. This was Ehud, a left-handed man, who was the son of Gera, from the tribe of Benjamin. The people of Israel sent Ehud to King Eglon of Moab with gifts for him.

1 Chronicles 12:2

All of them were expert archers who could shoot arrows or sling stones with their left hand as well as their right. They were all relatives of Saul from the tribe of Benjamin.

1 Samuel 17:40

He took his shepherd's stick and picked up five smooth stones from the stream and put them in his bag. With his sling ready, he went out to meet Goliath.

1 Samuel 17:49-50

He put a rock in his sling and swung the sling around by its straps. When he let go of one strap, the rock flew out and hit Goliath on the forehead. It cracked his skull. He fell facedown on the ground.

1 Samuel 25:29

Even if someone pursues you to take your life, your life is wrapped securely in the bundle (purse) (bag) of the living from Jehovah your God (God will keep you safe). He will dispose of the lives of your enemies. They will be hurled like stones from a sling.

2 Chronicles 26:14

Uzziah prepared shields, spears, helmets, armor, bows, and stones for slings for the entire army.

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
Then the Israelites cried out to Jehovah. So he sent someone to free them. This was Ehud, a left-handed man, who was the son of Gera, from the tribe of Benjamin. The people of Israel sent Ehud to King Eglon of Moab with gifts for him.
1 Chronicles 12:2
All of them were expert archers who could shoot arrows or sling stones with their left hand as well as their right. They were all relatives of Saul from the tribe of Benjamin.

Sling stones

1 Samuel 17:40
He took his shepherd's stick and picked up five smooth stones from the stream and put them in his bag. With his sling ready, he went out to meet Goliath.
1 Samuel 25:29
Even if someone pursues you to take your life, your life is wrapped securely in the bundle (purse) (bag) of the living from Jehovah your God (God will keep you safe). He will dispose of the lives of your enemies. They will be hurled like stones from a sling.
2 Chronicles 26:14
Uzziah prepared shields, spears, helmets, armor, bows, and stones for slings for the entire army.