Valmiki Ramayana 7.9.36
नभःस्थाने दुन्दुभयो देवानां प्राणदंस्तदा ।वाक्यं चैवान्तरिक्षे च साधु साध्विति तत्तदा॥
nabhaḥsthāne dundubhayo devānāṃ prāṇadaṃstadā |vākyaṃ caivāntarikṣe ca sādhu sādhviti tattadā ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book