Shiva Purana
निर्विकारादि साकारा निराकारापि देव्युमा ॥ देवानां तापनाशार्थं प्रादुरासीद्युगेयुगे ॥ ७५ ॥
Although free from aberrations, and devoid of forms and features, goddess Umā manifested herself in different Yugas for the destruction of the distress of the gods, after assuming different forms and features.
english translation
nirvikArAdi sAkArA nirAkArApi devyumA ॥ devAnAM tApanAzArthaM prAdurAsIdyugeyuge ॥ 75 ॥
hk transliteration by Sanscript