إِنَّا مُرْسِلُوا۟ ٱلنَّاقَةِ فِتْنَةً لَّهُمْ فَٱرْتَقِبْهُمْ وَٱصْطَبِرْ Qur’an Al-Qamar (54:27)Inn a mursiloo a l nn a qati fitnatan lahum fa i rtaqibhum wa i st abir
For this and other Qur'anic references to the she-camel that was to be "let loose as a test" for the Thamud, see surah {7}, note [57]. God's "letting her loose" is in this context evidently synonymous with "allowing her to become" a test.
See n. 1044 to vii. 73, for the she-camel as a trial or test case among selfish people who tried to monopolise water and pasture as against the poor.