Ramayana
तस्याहं लोकपालस्य वाक्यं तत्सुसमाहितः । नैव जात्वनृतं कार्यमिति मे सौम्य दर्शनम् ॥ 7-50-16 ॥
"Concerning that word of the guardian of the world I was most attentive, for it is my conviction, O gentle one, that an untruth must never be committed."
english translation