Shatapatha Brahmana 5.5.4.22

5.5.4.22

tāṃ darbhaiḥ pāvayati | pūtāsaditi vāyuḥ pūtaḥ pavitreṇa pratyaṅ somo atisrutaḥ indrasya yujyaḥ sakheti tatkuvalasaktūnkarkandhusaktūnbadarasaktūnityāvapatyetadvai tataḥ samabhavadyattrirniraṣṭhīvattenaivainametatsamardhayati kṛtsnaṃ karoti tasmādetānāvapati

He purifies it with stalks of Darbha-grass, thinking, 'Let it be pure,'--with (Vâg. S. X, 31), 'The inviting Soma, purified by the purifying (strainer), has overflown backwards, Indra's mated friend.' He then pours in flour of 'kuvala, karkandhu, and badara' berries, for when he (Indra) spit out thrice, that was what was produced therefrom: therewith he now supplies him and makes him whole,--therefore he pours in that (flour).