In the book of 2 Samuel, chapter 21, there is a great famine for three long years.
David blames this on Saul and for what he had done to the Gibeonites. Instead of gold or other riches, they seek the death of seven of his people. He chose seven sons from various families and they were hung. They were put to death on the first days of the harvest season, and the harvest became bountiful again.
Then, a war raged between Israel and the Philistines, for whom they aligned with the descendants of giants. One of these had six fingers on each hand and six toes on each foot.
In the end, David and his servants slayed them.