1 Samuel 14:13-15

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.