Judges 10 verse 17 through to chapter 11 verse 3.

At that time the armies of Ammon had gathered for war and were camped in Gilead, and the people of Israel assembled and camped at Mizpah. The leaders of Gilead said to each other, “Whoever attacks the Ammonites first will become ruler over all the people of Gilead.”

Now Jephthah of Gilead was a great warrior. He was the son of Gilead, but his mother was a prostitute. Gilead’s wife also had several sons, and when these half brothers grew up, they chased Jephthah off the land. “You will not get any of our father’s inheritance,” they said, “for you are the son of a prostitute.” So Jephthah fled from his brothers and lived in the land of Tob. Soon he had a band of worthless rebels following him.