The ruling on eating from the animal slaughtered on the day of 'Id al-Fitr?

Question : The questioner says: Honorable Shaykh, in our customs and traditions, we slaughter on the day of 'Id al-Fitr. You have issued a ruling that this is not prescribed. What is the evidence for its not being prescribed? And what is the ruling on eating from it?

Answer : Now, if a person says about something that it is not prescribed, is he required to provide evidence? No. The one who is required to provide evidence is the one who says that the thing is prescribed. Because the default in acts of worship is what?
It is reverence and the absence of prescription. As for the one who says about something other than an act of worship that it is forbidden, then at that point we say: bring the evidence. So we must know the default. Whoever relies on the default, his evidence is his default. And whoever relies on something other than the default is required to provide evidence. So if a person does something in the manner of worship, we say: bring the evidence that it is worship. And if a person does something from the customs and someone wants to prevent him, we say: what is the evidence for preventing it? Yes.
As for eating from it, there is nothing wrong with it, except if there is a benefit in not eating, such that these people are deterred from the act, in which case not eating is better.