Shiva Purana
पुरा विष्णुः पृथिव्यां चावततार सतां प्रियः ॥ २ ॥
Formerly, Viṣṇu the favourite of the good, took his incarnation as Rāma on the earth.
english translation
purA viSNuH pRthivyAM cAvatatAra satAM priyaH ॥ 2 ॥
hk transliteration by Sanscript