Valmiki Ramayana 2.97.16

कथं नु पुत्रा: पितरं हन्यु: कस्याञ्चिदापदि।भ्राता वा भ्रातरं हन्यात् सौमित्रे प्राणमात्मन:॥

kathaṃ nu putrā: pitaraṃ hanyu: kasyāñcidāpadi |bhrātā vā bhrātaraṃ hanyāt saumitre prāṇamātmana: ||

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