Sayyiduna Salman (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) was asked about cheese, ghee and wild asses, and the Messenger of Allah (peace and blessings be upon him) said: "What is declared lawful in the Qur'an is lawful, what Allah has declared unlawful in the Qur'an is unlawful, and what He was silent about, He has pardoned."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19391