Ramayana
अहं नियममातिष्ठे सिद्ध्यर्थं पुरुषर्षभ । तस्य विघ्नकरौ द्वौ तु राक्षसौ कामरूपिणौ ॥ १-१९-४
"O best among men for the successful completion of a sacrifice I took up a selfimposed religious observance. Two rakshasas, capable of assuming forms at will, are creating impediments to that sacrifice." ॥ 1-18-4॥
english translation
ahaM niyamamAtiSThe siddhyarthaM puruSarSabha । tasya vighnakarau dvau tu rAkSasau kAmarUpiNau ॥ 1-19-4
hk transliteration by Sanscript