Volume 5 · Book 59 · Hadith 403
Narrated Ibn Abbas: Allah's Wrath gets severe on a person killed by a prophet, and Allah's Wrath became severe on him who had caused the face of Allah's Apostle to bleed
— Sahih Bukhari, Volume 5, Book 59: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi), Hadith #403