Verse 34

And the children of Esau slew yet of them about two hundred and fifty men and from the people of the children of Esau there fell in that battle about thirty men, but this evil came upon them through their brethren turning from them to assist the children of Seir the Horite, and the children of Esau again heard of the evil doings of their brethren, and they again mourned on account of this thing.