Musnad Ahmad 491:0

Narrated Abu 'Amir al-Ash'ari: The Prophet (ﷺ) said: "There will be people from my nation who will deem adultery, silk, intoxicants, and musical instruments as lawful. And there will be people who will camp at the side of a high mountain, and their shepherd will come to them in the evening with their livestock, and a needy man will come to them for a need, and they will say: 'Return to us tomorrow.' Then Allah will destroy them during the night, and He will cause the mountain to fall upon them, and He will transform others among them into apes and swine until the Day of Resurrection."