Valmiki Ramayana Ayodhya Kanda Sarga 58 Shloka 18

देवि O mother, धर्मनित्या adhering to the righteous path, यथाकालम् in time, अग्न्यगारपरा भव perform the rituals in the chamber of sacrificial fire, देवस्य (your) lord's (king Dasaratha's), पादौ च feet also, देववत् like a god, परिपालय serve.

'O mother, adhering to the righteous path and performing in time the rituals in the chamber of sacrificial fire, offer your services at the feet of king Dasaratha as if he were a god.