Shiva Purana
श्वेतश्श्वेतशिखश्चैव श्वेताश्वः श्वेतलोहितः ॥ दुन्दुभिश्शतरूपश्च ऋचीकः केतुमांस्तथा ॥ ८ ॥
The white horse and the white horse are white and red Dundubhi and Shatarupa Richika and Ketuman.
english translation
zvetazzvetazikhazcaiva zvetAzvaH zvetalohitaH ॥ dundubhizzatarUpazca RcIkaH ketumAMstathA ॥ 8 ॥
hk transliteration by Sanscript