Valmiki Ramayana Yuddha Kanda Sarga 18 Shloka 23

कपोतेन: by a dove, शरणम् to seek refuge, आगतः came, शत्रुः enemy, यथान्यायम् according to practice, आर्चितश्च: offered, स्वैः its own, मांसैः flesh, निमन्त्रितश्च: without any jealousy, श्रूयतेहि: have heard.

"You have heard of the (story of a) dove that offered his own flesh to an enemy who came to seek protection according to tradition (of hospitality)."