“Certain persons of al-Khawarij asked me about this verse of al-Quran: ‘Of two sheep and of two goats, ask which one is made unlawful? (Is it) male or female? (6:142) (What is the meaning of) camels two and of cows two?’ (6:143) ‘What Allah has made lawful and what has He made unlawful?’ I did not have any answer. I went to see abu ‘Abd Allah (a.s.), when I was there for al- Hajj. I informed him (the Imam) of the story and he (the Imam) said, ‘Allah, most Majestic, most Glorious, for sacrifice in Mina’, has made domesticated sheep and goats lawful. He has made the wild ones unlawful, and His words, ‘Of camels two and of cows two’, means that Allah, most Blessed, most High, has made al-Trab camels lawful for offering as sacrifice and has made unlawful what is al- Bukhatiy. He has made domesticated cows lawful for offering as sacrifice and the wild ones unlawful.’ I returned to the man and informed him of the answer. He said, ‘This is something which camel has carried on its back from al-Hijaz.’”