Shiva Purana
तथा च भार्गवो रामो ह्याराध्य तपसा विभुम्॥ निरीक्ष्य दुःखितश्शर्वात्पितरं क्षत्रियैर्हतम् ॥ ५६ ॥
Similarly Rama son of Bhrigu worshiped the almighty by austerities He was grieved to see his father killed by the kshatriyas.
english translation
tathA ca bhArgavo rAmo hyArAdhya tapasA vibhum॥ nirIkSya duHkhitazzarvAtpitaraM kSatriyairhatam ॥ 56 ॥
hk transliteration by Sanscript