1 Samuel 14:11-15

11And both of them disclosed themselves unto the garrison of the Philistines: and the Philistines said, Behold, the Hebrews come forth out of the holes where they had hid themselves. 12And the men of the garrison answered Jonathan and his armorbearer, and said, Come up to us, and we will show you a thing. And Jonathan said unto his armorbearer, Come up after me; for Jehovah hath delivered them into the hand of Israel. 13And Jonathan climbed up upon his hands and upon his feet, and his armorbearer after him: and they fell before Jonathan; and his armorbearer slew them after him. 14And that first slaughter, which Jonathan and his armorbearer made, was about twenty men, within as it were half a furrow’s length in an acre of land. 15And there was a trembling in the camp, in the field, and among all the people; the garrison, and the spoilers, they also trembled; and the earth quaked: so there was an exceeding great trembling.