Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 6.p28

6.p28

vii. 2. He recites fifteen kindling verses; the kindling verses are a thunderbolt and the thunderbolt is fifteenfold. The butter portions refer to the slaying of Vṛtra; the butter portions referring to the slaying of Vṛtra are a thunderbolt. The invitatory and offering verses of the oblation are Triṣṭubh verses; the Triṣṭubh is a thunderbolt; by this thrice-formed thunderbolt the gods pushed away the Asuras from these worlds. Verily thus also the sacrificer with this thrice-formed thunderbolt pushes away the rivals who hate him from these worlds. The butter portions refer to the slaying of Vṛtra; they have been described. Next as to the invitatory and offering verses of the oblation, the former contains (the word) ‘to’, ‘Let your tongue move up to the ghee’; that is the symbol of the invitatory