What was the warning given by Prophet Muhammad (saw) about people who consider certain activities lawful?
      Narrated Abu 'Amir or Abu Malik Al-Ash'ari:                          that he heard the Prophet saying, "From among my followers there will      be some people who will consider illegal sexual intercourse, the      wearing of silk, the drinking of alcoholic drinks and the use of      musical instruments, as lawful. And there will be some people who will     stay near the side of a mountain and in the evening their shepherd      will come to them with their sheep and ask them for something, but      they will say to him, 'Return to us tomorrow.' Allah will destroy them     during the night and will let the mountain fall on them, and He will      transform the rest of them into monkeys and pigs and they will remain      so till the Day of Resurrection."