Abd al-Rahman bin Ghanm al-Ash'ari (may Allah have mercy on him) says that Abu Amir or Abu Malik (may Allah be pleased with him), who never lied to me, heard the Prophet (peace and blessings be upon him) say: "There will certainly be people in my Ummah who will regard silk, wine and musical instruments as lawful. And some people will settle at the foot of a mountain, and their herds will return to them in the evening after grazing. A man will come to them with his need, and they will say: Come back tomorrow. Then Allah will destroy them at night, bring the mountain down upon them, and transform others into monkeys and pigs until the Day of Resurrection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20988