Ramayana
युध्यतामेनतेषांतुतदावानरराक्षसाम् । रविरस्तंगतोरात्रिःप्रवृत्ताप्राणहारिणी ॥ ६-४४-१
Thus, as the Vanaras and Rakshasas were battling, the Sun began to set, which is not favourable to the life of Vanaras. [6-44-1]
english translation
yudhyatAmenateSAMtutadAvAnararAkSasAm । ravirastaMgatorAtriHpravRttAprANahAriNI ॥ 6-44-1
hk transliteration by Sanscript