Gobhilagrihyasutra 3.9.18

3.9.18

samupaviṣṭeṣu gṛhapatiḥ svastare nyañcau pāṇī pratiṣṭhāpya syonā pṛthivi no bhave 'ty etām ṛcaṃ japati.

When they are seated, the householder touches the layer (of grass) with his two hands turned downwards, and murmurs the verse, 'Be soft to us, O Earth' (ibid. 4).