Valmiki Ramayana Yuddha Kanda Sarga 131 Shloka 59

ततः then, ब्राह्मणैःसह with brahmins, वृद्धःaged, वसिष्ठः Vasishta, प्रयतः active, ससीतम् Sita, रामम्Rama, रत्नमये full of precious stones, पीठे plank, सन्नयवेशयत् to take seat.

Then accompanied by brahmins, sage Vasishta, active though aged, asked Sita and Sri Rama to occupy the plank made with full of precious stones.