Agniveshyagrihyasutra 2.5.3.33

2.5.3.33

athāgreṇāgniṃ dūrvāstambe hutaśeṣaṃ nidadhāti mā no mahāntaṃ mā nastoka iti dvābhyām \

Then, in front of the fire, he deposits the remainder of the offering upon a clump of dūrvā grass with the two [verses]: "Harm us not in our elder, harm us not in our child..." and "Harm not our young...".