Ramanujacharya's Brahma Sutra Bhashya translated By George Thibaut
SriBhashya - Ramanuja's Commentary On Brahma Sutra (Vedanta Sutra)

45. (They are) the priest's work, Audulomi thinks; since for that he is engaged.

The teacher Audulomi is of opinion that the meditation on the Udgîtha and the like is the work of the priest, since it is he who is engaged for the purpose of performing that which gives rise to the fruit, i.e. of the entire sacrifice with all its subordinate parts. Injunctions referring to the performance of the sacrifices such as 'he chooses the priests; he gives to the priests their fee' indicate that the entire sacrificial performance is the work of the priests, and that hence all activities comprised within it--mental as well as bodily--belong to the priests. Capability or non-capability does not constitute the criterion in this case. For although the meditations in question aim directly at the benefit of man (not at the greater perfection of the sacrifice), yet since they fall within the sphere of qualification of those who are qualified for the sacrifice, and since the sacrifice with all its subordinate elements has to be performed by the priests, and since the text 'whatever he does with knowledge that becomes more vigorous ' declares knowledge to belong to the same agent as the works which are benefited by such knowledge, we conclude that those meditations also are the exclusive duty of the priests. In the case of the meditations on the small ether, &c., on the other hand, the text says nothing as to their having to be performed by priests, and we therefore assume in accordance with the general principle that 'the fruit belongs to the performer,' that the agent there is the person to whom Scripture assigns the fruit.--Here terminates the adhikarana of 'the lord (of the sacrifice).'