Brihat Samhita
ब्रह्मसुत एक एव त्रिशिखो वर्णैस्त्रिभिर्युगान्तकरः । अनियतदिक्सम्प्रभवो विज्ञेयो ब्रह्मदण्डाख्यः ॥ ११-१५ ॥
A single comet possessing three tails and three colours is called Brahmadaṇḍa (born of the creator); it appears anywhere; when it appears the world will come to an end.
english translation
brahmasuta eka eva trizikho varNaistribhiryugAntakaraH । aniyatadiksamprabhavo vijJeyo brahmadaNDAkhyaH ॥ 11-15 ॥
hk transliteration by Sanscript