The People of Thamud were Arab and they were after the People of Ad but they did not heed the example God made of the Ad. They did like the Ad did in their disobedience. God permitted them to build castles in the open places of the earth and made them skilled in building. Salih was sent as a prophet to the people of Thamud. They did not believe him, but asked him to show them a sign of his prophethood. He produced a she-camel from a rock, but the People of Thamud killed the she-camel land did not listed to Salih, so God destroyed them.