Valmiki Ramayana Bala Kanda Sarga 25 Shloka 9
Original Shlokaसुन्दे तु निहते राम सागस्त्यमृषिसत्तमम्। ताटका सह पुत्रेण प्रधर्षयितुमिच्छति।।1.25.9।।
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राम: O Rama, सुन्दे when Sunda, निहते was killed, सा ताटका that Tataka, पुत्रेण सह along with her son, ऋषिसत्तमम् excellent of sages, अगस्त्यम् Agastya, प्रधर्षयितुम् to attack him, इच्छति desires(ed).
O Rama when Sunda died Tataka along with her son wanted to attack Agastya, the best of sages.