Halakhah zu Wajikra 7:24

From the laws of the commandment is that which they, may their memory be blessed, said (Avodah Zarah 67b) that [only] a carcass that is fit for a (gentile) stranger [to eat] is called a carcass and carries liability for its eating; but a carcass that is not fit for a stranger - meaning to say, a putrid carcass - does not carry liability for its eating. And because of this, the verse was lengthy to say, "you may give it to the stranger" - to teach you this. As if it were not so, there is no need to teach us to who to give that which we have. And it should not be said that it is coming to permit its benefit, as it is already written in another place (Leviticus 7:24), "Fat of the carcass and fat of the 'torn' [animal] may be used for any work." And from here they, may their memory be blessed, learned (Avodah Zarah 65b) the law that exuding taste that spoils is permissible. As we know through this that the Torah only forbids and makes liable for the eating of things that are fitting for people to eat; not for something that disgust a person's soul, as that is considered just like any dirt. And this is the dispensation that is mentioned in the Gemara about forbidden vinegar that fell into split beans, since it spoils them. And from this principle, we have become accustomed to purge vessels in boiling water that have not been used for a day, even though there is not sixty parts in the water corresponding to [the mass] of the vessel - as the absorbed [prohibited matter] that comes out from [it] when it is has not been used in a day is spoiled. And since the absorbed [matter] went out from the vessel due to the power of the water the nature of which is to purge and take out all of what is absorbed in the vessel - even though the vessel sits afterward with the absorbed waters that the vessel expunged into the boiling waters that are less than sixty [parts to it] and goes back and absorbs from it - it is not prohibited through this, as the [absorbed matter] is like a putrid carcass, which the Torah permitted, as we have said.