Rudra-prasava-varṇana
The Manifestation and Naming of Rudra / Nīlalohita
अविज्ञातगतिश्चैव द्वौ पुत्रौ चानिलस्य तु / नाम्ना पशुपतेर्या तु तनुरग्निर्द्विजैः स्मृता
avijñātagatiścaiva dvau putrau cānilasya tu / nāmnā paśupateryā tu tanuragnirdvijaiḥ smṛtā
Anila also has two sons whose course is unknown. And the manifestation of Paśupati named Agni, the Fire, is remembered by the twice-born sages.