Valmiki Ramayana Bala Kanda Sarga 15 Shloka 3
Original Shlokaतत: प्राक्रमदिष्टिं तां पुत्रीयां पुत्रकारणात्। जुहाव चाग्नौ तेजस्वी मन्त्रदृष्टेन कर्मणा।।1.15.3।।
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तत: then, पुत्रकाराणात् for begetting sons, पुत्रीयाम् for the sake of begetting children, ताम् इष्टिम् that sacrifice, प्राक्रम्यत् having commenced, तेजस्वी effulgent Rsyasringa मन्त्रदृष्टेन in accordance with mantras, कर्मणा with sacrificial acts, अग्नौ in the fire, जुहाव च poured oblations.
To help Dasaratha beget sons, brilliant Rsyasringa commenced putriyeshti, a sacrifice for begetting children, by pouring oblations into sacrificial fire and chanting mantras in accordance with traditions.