Valmiki Ramayana Ayodhya Kanda Sarga 35 Shloka 25

ततः then, वरदः the conferor of boons, सः साधुः that holy man, राजानम् to the king, प्रत्यभाषत answered, महीपते O King, इयम् she, म्रियताम् let her die, ध्वंसतां वा or be destroyed, त्वम् you, मा कृथाः do not disclose (don't tell).

That holy man who had granted the boon (to the king) had said, 'Let her die or destroy herself, but do not disclose (the cause of your laughter).