1 Samuel 14:10-14

But if they say, ‘Come up to us,’ then we will go up, for the Lord has handed them over to us; and this shall be the sign to us.”

When the two of them revealed themselves to the garrison of the Philistines, the Philistines said, “Behold, Hebrews are coming out of the holes where they have kept themselves hidden.”

So the men of the garrison responded to Jonathan and his armor bearer and said, “Come up to us and we will inform you of something.” And Jonathan said to his armor bearer, “Come up after me, for the Lord has handed them over to Israel.”

Then Jonathan climbed up on his hands and feet, with his armor bearer behind him; and the men fell before Jonathan, and his armor bearer put some to death after him.

Now that first slaughter which Jonathan and his armor bearer inflicted was about twenty men within about half a furrow in an acre of land.