Valmiki Ramayana Ayodhya Kanda Sarga 37 Shloka 21
Original Shlokaचीरे गृहीते तु तया समीक्ष्य नृपतेर्गुरुः। निवार्य सीतां कैकेयीं वसिष्ठो वाक्यमब्रवीत्।।2.37.21।।
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तया by her, चीरे bark garment, गृहीते was worn, नृपतेः king's, गुरुः preceptor, वसिष्ठः Vasistha, समीक्ष्य having seen, सीताम् of Sita, निवार्य having restrained, कैकेयीम् to Kaikeyi, (वाक्यम्) अब्रवीत् said.
When Sita wore the bark garments, Vasistha, the king's preceptor who was watching this restrained her (Sita) and said to Kaikeyi: