There is a dispute with regard to a case of an ordinary innocuous ox and a disqualified consecrated ox that gored another ox together. What is this case of an ox that was consecrated and disqualified? It is a firstborn ox that became blemished and was consequently disqualified as an offering. Nevertheless, its initial consecration remains, and therefore it may not be redeemed. Consequently, the priest in possession of it is not liable to pay damages, since it is not classified as: The ox of another, as its status is not that of a non-sacred ox belonging to a person. Given this background, what is the liability of the owner of the non-sacred ox that gored together with it? Abaye says: He pays half the cost of the damage, whereas Ravina says: He pays 1/4th of the cost of the damage.
הא והא בתם; הא כרבנן, והא כרבי נתן.
The Talmud explains the dispute: Both this one, Abaye, and that one, Ravina, refer to a case where the ordinary ox was innocuous. This opinion stated by Ravina is in accordance with the opinion of the Rabbis that each party is responsible for only half the damage. Since the non-sacred ox was innocuous, its owner pays half the cost of the damage for which he is responsible, i.e., 1/4th of the total. And that opinion stated by Abaye is in accordance with the opinion of R' Natan that each party in turn is responsible for all the damage. Consequently, since the non-sacred ox is innocuous, its owner pays half the total amount.