Musannaf Ibn Abi Shayba 18:962

Abu Bakr narrated to us, he said: Shareek narrated to us, from Zayd ibn Jubayr, from Jarwah ibn Humayl, from his father, he said: Umar said: "Does one of you intend toward his brother and strike him with something like a flesh-eating disease? I will not be brought a man who did that and killed [him] except that I will execute retaliation against him for it."