Ramayana
यो हि मामनृतं कुर्याद्देवो वा मानुषो ऽपि वा । त्रैलोक्यमनृतं तेन कृतं स्यान्नात्र संशयः ॥ 7-22-41 ॥
"For whoever, whether god or man, should make me false, by him the three worlds would be made false—of this there is no doubt."
english translation