Valmiki Ramayana Ayodhya Kanda Sarga 24 Shloka 25
Original Shlokaव्रतोपवासनिरता या नारी परमोत्तमा। भर्तारं नानुवर्तेत सा तु पापगतिर्भवेत्।।2.24.25।।
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या नारी whichever woman, व्रतोपवासनिरता engaged in vows and fastings, परमोत्तमा highly pious, भर्तारम् husband, नानुवर्तेत does not follow, सा she, पापगतिः hell a, भवेत् will get.
A woman may be highly pious engaged in vows and fastings, but if she does not follow her husband, she will be condemned to hell.