The Monk in the Pāli Vinaya: Priest or Wedding Guest?
By Richard Gombrich
The brahmins would indeed take umbrage at being closely associated with the officiant, because the very fact of his being there as an officiant means that he is doing a paid job and so lowers his status below theirs. [The brahmins, in contrast,] have no duties; they are gracing the occasion.
On (one of) the differences between a priest and a Buddhist monk.