Valmiki Ramayana Bala Kanda Sarga 8 Shloka 15

सरय्वा: of river Sarayu, उत्तरे तीरे on the northern bank, यज्ञभूमि: sacrificial pavillion, विधीयताम् be constructed, यथाकल्पम् according to prescribed ritual code, यथाविधि according to the ordinance, शान्तयश्च expiatory rites, अभिवर्धन्ताम् may be wished.

On the northern bank of Sarayu, a sacrificial pavillion be prepared according to the methods ordained in the 'Kalpa'. Auspicious rites be performed in accordance with the ordinance for its uninterrupted completion.