Yahya bin Khalaf al-Muqri (may Allah have mercy on him) said: I was with Malik bin Anas (may Allah have mercy on him) when a man came and said: What is your view about one who says the Qur'an is created? He said: In my view he is a disbeliever; kill him.
(b) Yahya bin Khalaf (may Allah have mercy on him) said: I asked al-Layth bin Sa'd and Ibn Lahi'ah (may Allah have mercy on them both): What is the ruling on one who says the Qur'an is created? They both said: He is a disbeliever.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20889