Salman told that when God’s messenger was questioned about clarified butter, cheese and wild asses he replied, “What is lawful is what God has declared lawful in His Book, what is unlawful is what God has declared unlawful in His Book, and what He has said nothing about belongs to the things He ignores.” Ibn Majah and Tirmidhi transmitted it, Tirmidhi saying this is a gharib tradition which, according to the soundest opinion, is mauquf.