Musannaf Ibn Abi Shayba 18:146

Abu Bakr narrated to us, he said: Muhammad ibn Bakr narrated to us, from Ibn Jurayj, from ‘Amr ibn Shu’ayb, he said: Abu Bakr judged regarding the eyebrow, if it is injured until its hair is gone, with two *mudihah* wounds (wounds that expose the bone), [the compensation is] ten camels.