Ramayana
तस्मादेवमहं ब्रह्मन् वैवस्वतवधोद्यतः । गच्छामि दक्षिणामाशां यत्र सूर्यात्मजो नृपः ॥ 7-20-23 ॥
For that very reason, O Brahmin, intent upon slaying Vaivasvata (Yama, son of Vivasvat), I am going to the southern quarter, where dwells the king who is the son of the Sun.
english translation