Ramayana
एवमेतत्पुरावृत्तं वालिना रावणः प्रभो । धर्षितश्च कृतश्चापि भ्राता पावकसन्निधौ ॥ 7-34-45 ॥
"Thus, O lord, did this happen in former times: Ravana was overpowered by Vali and was made his brother in the presence of the fire."
english translation