Mimamsasutra 42.2.51

42.2.51

(aṣṭādaśe - sauryādiṣu pārvaṇahomādyananuṣṭhānādhikaraṇe sūtrāṇi 51-56)|
pārvaṇahomayostvapravṛttiḥ samudāyārthasaṃyogāttadabhījyā hi ||

(In the eighteenth topical section, on the non-performance of the Pārvaṇa offerings and the like in the Saurya and other rites, sūtras 51–56:)
However, there is no application of the two Pārvaṇa offerings, because they are connected with the purpose of the aggregate; for the sacrifice is to that [aggregate].