Śatapatha Brāhmaṇa ("of a hundred paths") 14.1.2.12

14.1.2.12

athādārān indrasyauja stheti yatra vā enamindra ojasā paryagṛhṇāttadasya parigṛhītasya raso vyakṣaratsa pūyannivāśeta so'bravīdādīryeva bata ma eṣa raso'stauṣīditi tasmādādārā atha yatpūyannivāśeta tasmātpūtīkāstasmādagnāvāhutirivābhyāhitā jvalanti tasmādu surabhayo yajñasya hi rasātsambhūtā atha yadenaṃ tadindra ojasā paryagṛhṇāttasmādāhendrasyauja stheti makhasya vo'dya śiro rādhyāsaṃ devayajane pṛthivyā makhāya tvā makhasya tvā śīrṣṇa ityasāveva bandhuḥ

Then Âdâra (-plants), with (Vâg. S. XXXVII, 6), 'Indra's might ye are,'--for when Indra encompassed him (Vishnu) with might, then the vital sap of him, thus encompassed, flowed away; and he lay there stinking, as it were. He said, 'Verily, after bursting open (â-dar), as it were, this vital sap has sung praises:' thence Âdâra (-plants originated); and because he lay there stinking (pûy), as it were, therefore (they are also called) Pûtîka; and hence, when placed on the fire as an offering, they blaze; and hence also they are fragrant, for they originated from the vital sap of the sacrifice. And inasmuch as Indra, on that occasion, encompassed him with might, therefore he says, 'Indra's might ye are;'--'may I this day compass for you Makha's head on the Earth's place of divine worship: for Makha thee! for Makha's head thee!' the import of this is the same as before.