Ramayana
अवध्यत्वं मया प्राप्तं देवगन्धर्वदानवैः । राक्षसैर्गुह्यकैर्नागैर्ये चान्ये बलवत्तराः ॥ 7-16-42 ॥
I have obtained invulnerability from gods, gandharvas, and danavas, from rakshasas, guhyakas, and nagas, and from others mightier still.
english translation