Mimamsasutra 2.2.3

Injunction and corroborative statement have mutual expectancy regarding praise and human purpose; / therefore, they have single sentencehood; hence, corroborative statements have authoritativeness regarding dharma.

In the section on optional animal sacrifices, an injunction and a corroborative statement are heard: "One desirous of prosperity should sacrifice a white [beast] dedicated to Vāyu" is the injunction; "Vāyu, indeed, is the swiftest deity; he runs to Vāyu himself with his own share; he alone leads him to prosperity" is the corroborative statement. There, the words 'dedicated to Vāyu' and so on situated in the injunctive sentence enjoin a qualified object quite independently of the words of the corroborative statement. And the words of the corroborative statement narrate an established fact quite independently of the other. When it is said, "Vāyu, who moves swiftly, being gratified by his proper share, grants prosperity to the giver of the share," some narrative is understood just as in the Rāmāyaṇa, Mahābhārata, and the like, but no action to be performed [is understood]. Hence, since there is no unified sentencehood, a corroborative statement has no validity with regard to dharma—this having been arrived at,

we reply: Let there not be unified sentencehood of words; but unified sentencehood of sentences does exist. First, the injunctive sentence requires the praiseworthiness of the enjoined object in order to motivate a person. And the corroborative sentence requires a human goal, because it is encompassed by the injunction of study which terminates in the understanding of meaningful objects. There, the corroborative sentence, presenting through secondary signification the praiseworthiness required by the injunction that terminates in a human goal, attains unified sentencehood with the injunctive sentence. The syntactic connection of the two sentences is: "Since Vāyu, by his nature of moving swiftly, is a grantor of swift fruit, [and] is the deity of this animal, therefore one should sacrifice this praiseworthy animal dedicated to Vāyu." Therefore, corroborative statements are a means of valid cognition with regard to dharma.