Hadith 8:2193
Abu Bakr narrated to us, he said: Ibn ‘Uyaynah narrated to us, from al-Zuhri, from Salim, from Ibn ‘Umar, he said: ‘Umar was asked about killing a snake while one is in the state of ihram, and he said: "Kill them."
حدثنا أبو بكر قال حدثنا بن عيينة عن الزهري عن سالم عن بن عمر قال سئل عمر عن قتل الحية وهو محرم فقال أقتلوهن