Valmiki Ramayana 5.55.1

लङ्कां समस्तां सन्दीप्य लाङ्गूलाग्निं महाबलः ।निर्वापयामास तदा समुद्रे हरिसत्तमः॥

laṅkāṃ samastāṃ sandīpya lāṅgūlāgniṃ mahābalaḥ |nirvāpayāmāsa tadā samudre harisattamaḥ ||

Our plain-language meaning of this verse is waiting for scholar review.