Valmiki Ramayana 1.45.27
ततो देव असुराः सर्वे ममन्थू रघुनंदन ।प्रविवेश अथ पातालम् मन्थानः पर्वतोत्तमः॥
tato deva asurāḥ sarve mamanthū raghunaṃdana |praviveśa atha pātālam manthānaḥ parvatottamaḥ ||
Our plain-language meaning of this verse is waiting for scholar review.
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