Valmiki Ramayana 3.3.6

तपसा च अभि संप्राप्ता ब्रह्मणो हि प्रसादजा ।शस्त्रेण अवध्यता लोके अच्छेद्य अभेद्यत्वम् एव च॥

tapasā ca abhi saṃprāptā brahmaṇo hi prasādajā |śastreṇa avadhyatā loke acchedya abhedyatvam eva ca ||

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