Valmiki Ramayana Ayodhya Kanda Sarga 88 Shloka 12
Original Shlokaविदेहराजस्य सुता सीता च प्रियदर्शना। दयिता शयिता भूमौ स्नुषा दशरथस्य च।।2.88.12।।
1 source checked for this shloka
विदेहराजस्य king of Videha, सुता daughter, प्रियदर्शना one who causes delight to the beholder, दशरथस्य Dasaratha's, दयिता beloved, स्नुषा च daughterinlaw also, सीता च Sita too, भूमौ on the ground, शयिता rested.
Sita, daughter of Janaka, king of Videha, and beloved daughterinlaw of Dasaratha who caused delight to the beholder, too had to rest on the bare ground.