Ramayana
प्रचेतसो ऽहं दशमः पुत्रो राघवनन्दन । न स्मराम्यनृतं वाक्यमिमौ तु तव पुत्रकौ ॥ 7-96-19 ॥
"I, O delight of the Raghus, am the tenth son of Prachetas, and I do not recall ever having uttered a false word; these two are indeed your sons."
english translation