Mukhtasar Bukhari

It is narrated from Sayyiduna Abu Amir Ash'ari (may Allah be pleased with him) that he heard the Noble Prophet (peace and blessings of Allah be upon him) say: "There will be some groups in my Ummah who will consider adultery, wearing silk, drinking wine, and musical instruments as lawful, and there will be some groups who will live on the side of a mountain. In the evening, when their shepherd brings their herd to them, a poor person will come to them and ask for his need. They will reply, '(Not today) come tomorrow.' So Allah Almighty will destroy them that very night and cause the mountain to fall upon them, and the rest will be transformed (metamorphosed) into monkeys and pigs. They will remain in this punishment of Allah until the Day of Resurrection."