Jihad (Kitab Al-Jihad)
Dawud :: Book 14 : Hadith 2681
Narrated AbuAyyub al-Ansari:
AbuDawud said: The narrators other than Sa'id reported from Ibn Wahb in this tradition: "(Killed him) with arrows in confinement." When AbuAyyub al-Ansari was informed about it, he said: I heard the Apostle of Allah (peace_be_upon_him) prohibiting to kill in confinement. By Him in Whose hands my soul is, if there were a hen, I would not kill it in confinement. AbdurRahman ibn Khalid ibn al-Walid was informed about it (the Prophet's prohibition). He set four slaves free.