"pay shall he pay an ox for an ox": This tells me only (that he pays) a beast. Whence do I derive (that he can also pay) money? It follows, viz.: It is written here "and the carcass shall belong to him," and elsewhere (21:34) "and the carcass shall belong to him." Just as here, (he can pay) with a beast, so, there, with a beast. Just as there, (he can pay) with money, so, here, (he can pay) with money.