It is narrated from Sayyiduna Imran bin Husayn (may Allah be pleased with him): A woman cursed her she-camel, so the Prophet (peace and blessings be upon him) said to her: "It has become cursed, so leave it." He said: "Then I saw it wandering after the camping places, and no one would interfere with it - an ash-grey she-camel."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15540