Shiva Purana
पृषदश्वो नभोयोनिः सुप्रतीकस्तमिस्रहा ॥ निदाघस्तपनो मेघभक्षः परपुरंजयः ॥ ८० ॥
The bull horse is the source of the sky and is a good symbol and destroyer of darkness. He is the heat of summer and the devourer of clouds and the conqueror of enemy cities.
english translation
pRSadazvo nabhoyoniH supratIkastamisrahA ॥ nidAghastapano meghabhakSaH parapuraMjayaH ॥ 80 ॥
hk transliteration by Sanscript