Ramayana
उत्तरं नहि वक्तव्यं ज्येष्ठेनाभिहिते पुनः । अधर्मसहितं चैव परलोकविवर्जितम् ॥ 7-63-6 ॥
"No reply is to be made again once an elder has spoken — a reply that is attended by unrighteousness and bereft of the world hereafter."
english translation