Hadith 8:2194
Abu Bakr narrated to us, he said: Waki' narrated to us, from Usamah, from Nafi', who said: We were with Ibn Umar while we were in the state of ihram, and we saw a snake. Salim rushed toward it and killed it.
حدثنا أبو بكر قال حدثنا وكيع عن أسامة عن نافع قال كنا مع بن عمر ونحن محرمون فرأينا حية فبدرنا سالم فقتلها