Judges 11:1-6

1 Now Jephthah the Gileadite was a mighty man of valor, and he was the son of a prostitute: and Gilead became the father of Jephthah.  2 Gilead's wife bore him sons; and when his wife's sons grew up, they drove out Jephthah, and said to him, You shall not inherit in our father's house; for you are the son of another woman.  3 Then Jephthah fled from his brothers, and lived in the land of Tob: and there were gathered vain fellows to Jephthah, and they went out with him.  4 It happened after a while, that the children of Ammon made war against Israel.  5 It was so, that when the children of Ammon made war against Israel, the elders of Gilead went to get Jephthah out of the land of Tob;  6 and they said to Jephthah, Come and be our chief, that we may fight with the children of Ammon.