Canto 2 -
Ayodhyā-kāṇḍa
Chapter 26: Rāma Meets Sītā and Instructs Her
Text 2.26.27

तस्मै दत्तं नृपतिना यौवराज्यं सनातनम्।
स प्रसाद्यस्त्वया सीते नृपतिश्च विशेषतः॥

tasmai dattaṁ nṛpatinā yauvarājyaṁ sanātanam
sa prasādyas tvayā sīte nṛpatiś ca viśeṣataḥ

tasmai = Him; dattam = has made; nṛpatinā = King Daśaratha; yauvarājyam = the crown prince; sanātanam = forever; saḥ = the; prasādyaḥ = should please and serve; tvayā = you; sīte = Sītā; nṛpatiḥ = king; ca = and; viśeṣataḥ = especially.

King Daśaratha has made Him the crown prince forever. Sītā, you should especially please and serve the king.