Gobhilagrihyasutra 3.2.48

3.2.48

aindraḥ sthālīpākas: tasya juhuyād ṛcaṃ sāma yajāmaha ity etaya rcā, sadasas patim adbhutam iti vo 'bhābhyāṃ vā;

A mess of cooked food, sacred to Indra, (is prepared). Let him sacrifice of that (food) with this verse, 'To the Rik, to the Sâman we sacrifice' (Sâma-veda I, 369), or (with the verse), 'The lord of the seat, the wonderful' (ibid. I, 171), or with both (verses).