Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 7.3.10

7.3.10

asaṃsthita iva vā atra yajño yat saumyo adhvaraḥ / (soma: dīkṣaṇīyeṣṭi)

For here the sacrifice is, as it were, uncompleted, because it is a Soma sacrifice;