Valmiki Ramayana 6.99.6

आयसं परिघं गृह्य सूर्यरश्मिसमप्रभम्।समरे वानरश्रेष्ठो महापार्श्वे न्यपातयत्॥

āyasaṃ parighaṃ gṛhya sūryaraśmisamaprabham |samare vānaraśreṣṭho mahāpārśve nyapātayat ||

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