Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/31/35

तद्रूपं च तदा दृष्ट्वा सर्वे पूतास्ततस्स्वयम् ।। कृतवान्राघवः पूजां शिवधर्मपरायणः ।। ३५ ।।

sanskrit

On seeing that form, they became sanctified. Rāma himself, interested in Saiva cult, performed the worship.

english translation

tadrUpaM ca tadA dRSTvA sarve pUtAstatassvayam || kRtavAnrAghavaH pUjAM zivadharmaparAyaNaH || 35 ||

hk transliteration by Sanscript