Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Saeed bin Ubaidah. He says that a man asked Hazrat Ibn Umar (may Allah be pleased with them both) about cheese. So Hazrat Ibn Umar (may Allah be pleased with them both) asked him, "What is cheese?" He said, "It is made from milk." Hazrat Ibn Umar (may Allah be pleased with them both) said to him, "Eat cheese and drink (from it) as well." The man said, "It also contains carrion." Hazrat Ibn Umar (may Allah be pleased with them both) said to him, "Do not eat carrion."