Shiva Purana
सदाशिवेन देवानां हितार्थं रूपमद्भुतम्॥ शारभं च धृतन्दिव्यं ज्वलज्ज्वालासमप्रभम् ॥ ४॥
For the benefit of the gods, the wonderfully divine form of a Śarabha (the mythological animal with eight legs and capacity of killing lions) of blazing fire-like lustre was assumed by lord Śiva.
english translation
sadAzivena devAnAM hitArthaM rUpamadbhutam॥ zArabhaM ca dhRtandivyaM jvalajjvAlAsamaprabham ॥ 4॥
hk transliteration by Sanscript