Our custom is that if one of us sees a deceased person in a dream, he immediately slaughters a sacrificial animal for that deceased person and invites people to the feast.

Question:
Honorable Shaykh, may Allah grant you success. He says: In our tribe, there is a custom that if one of the living sees a deceased person in a dream, he immediately slaughters a sacrificial animal for that deceased person and invites people to this feast, then they make du'a for the deceased. What is the ruling on this action?

Answer:
This is not permissible. A dream does not give rise to any legal rulings. Slaughtering is a legal ruling, and it is not permissible to slaughter based on a dream or something similar to it. So it is not permissible. However, if you see the deceased person and he instructs you to pay off his debt, informs you that he has a debt, that he owes a debt to so-and-so, and instructs you to pay it off, there is no harm. Or if he instructs you to make du'a for him, there is no harm. But if he instructs you to slaughter, it is not permissible.