Musannaf Ibn Abi Shaybah

It is narrated from Yaqub that a person from my neighborhood passed away and he made a will that a sacrificial camel (badnah) should be offered on his behalf. I asked Hazrat Ibn Abbas (may Allah be pleased with them) whether a cow could be slaughtered instead. He replied, "It will suffice." He then asked, "Which tribe are you from?" I replied, "From Banu Rabah." He said, "How did Banu Rabah come to have cows? Cows are found with the Azd and the tribe of Abd Qais."