Sayyiduna Salman (may Allah be pleased with him) said: I asked the Messenger of Allah (peace and blessings be upon him) about furs, clarified butter and cheese, and he (peace and blessings be upon him) said: "The lawful is what Allah has made lawful in His Book, and the unlawful is what Allah has made unlawful in His Book, and whatever Allah has remained silent about is among the things He has pardoned."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6099