Sulayhah bint Abi Nu'aym al-Fadl bin Dukayn (may Allah have mercy on her) narrates: I heard my father (Imam Abu Nu'aym al-Fadl bin Dukayn, may Allah have mercy on him) say: "The Qur'an is the Speech of Allah, not created; whoever says that the Qur'an is created is a disbeliever."
Hadith Referenceالمعجم الأوسط / باب الصاد / 3678
Hadith Takhrij«أخرجه الطبراني فى «الصغير» برقم: 1198»