Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 2724
Salim reported on the authority of his father (Allah be pleased with them) that the Apostle of Allah (may peace be upon him) said: Five are the (beasts) which if one kills them in the precincts of the Ka'ba or in the state of lhram entail no sin: rat, scorpion, crow, kite and voracious dog. In another version the words are:" as a Muhrim and in the state of lhram".