Tafsir of Al-Qamar 54:27

إنا مرسلو الناقة فتنة لهم

Verily, We are sending the she-camel as a test for them. To test and try the people of Thamud, Allah sent to them a superb, pregnant female camel that emerged from solid rock, according to their request, so that it would become a proof against them from Allah, the Exalted. Thereafter, they were supposed to believe in what was brought to them by Salih, peace be upon him. Allah ordered His servant and Messenger Salih,

فارتقبهم واصطبر

So watch them, and be patient! Allah commanded, `await, O Salih, and see what will become of them and be patient; verily the better end will be yours and you will have success in this life and the Hereafter,'