What is the ruling on slaughtering the hady before the Day of Sacrifice?

Question : I say to the one who asked us, if he slaughtered before the Day of Sacrifice, whether it was based on a fatwa from one of the scholars or on his own assumption that it was permissible?

Answer : As for the one who did it based on a fatwa, we do not tell him to repeat it. As for the one who did it based on his own assumption, we tell him to repeat it, because he has no excuse. If Allah wills. Yes.