Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 5
विश्वामित्राध्वरे येन मारीचाद्या निशाचरा: ।पश्यतो लक्ष्मणस्यैव हता नैर्ऋतपुङ्गवा: ॥ ५ ॥
viśvāmitrādhvare yenamārīcādyā niśā-carāḥpaśyato lakṣmaṇasyaivahatā nairṛta-puṅgavāḥ
In the arena of the sacrifice performed by Viśvāmitra, Lord Rāmacandra, the King of Ayodhyā, killed many demons, Rākṣasas and uncivilized men who wandered at night in the mode of darkness. May Lord Rāmacandra, who killed these demons in the presence of Lakṣmaṇa, be kind enough to give us protection.