Valmiki Ramayana Yuddha Kanda Sarga 79 Shloka 17
Original Shlokaमकराक्ष्वचश्श्रुत्वारामोदशरथात्मजः । अब्रवीत्प्रहसन्वाक्यमुत्तरोत्तरवादिनम् ।।6.79.17।।
1 source checked for this shloka
दशरथात्मजःDasharatha's son, रामःRama, मकराक्ष्वचःMaka raksha's, श्रुत्वा on hearing, प्रहसन् laughing, उत्तरोत्तरवादिनम् speaking again and again, वाक्यम् words, अब्रवीत् said
Laughing at the words of Maka raksha who was speaking again and again Rama said.