Brihat Samhita
वक्रशिखा मृत्युसुता रूक्षाः कृष्णाश्च ते अपि तावन्तः । दृश्यन्ते याम्यायां जनमरकऽवेदिनस्ते च ॥ ११-१२ ॥
The Ketus or comets whose tails are bent and which are of sharp rays and black are the sons of Yama; they are 25 in number; they appear in the south; when they appear there will be deaths in the land.
english translation
vakrazikhA mRtyusutA rUkSAH kRSNAzca te api tAvantaH । dRzyante yAmyAyAM janamaraka'vedinaste ca ॥ 11-12 ॥
hk transliteration by Sanscript