Valmiki Ramayana Ayodhya Kanda Sarga 8 Shloka 37
Original Shlokaदर्पान्निराकृता पूर्वं त्वया सौभाग्यवत्तया। राममाता सपत्नी ते कथं वैरं न शातयेत्।।2.8.37।।
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त्वया by you, सौभाग्यवत्तया being fortunate (being favourite wife of your husband), दर्पात् from pride, पूर्वम् earlier, निराकृता was slighted, ते your, सपत्नी cowife (Kausalya), राममाता Rama's mother, वैरम् grudge, कथम् how, न शातयेत् will not retaliate.
Being fortunate (being the favourite wife of your husband) you slighted your cowife earlier with pride. How will she, Rama's mother (Kausalya) remain without retaliating?