Slaughter to appease an opponent is a ruling by other than what Allah has revealed

Some tribes have customs where, if two people dispute and they want to reconcile them,He says to him: they swear to him, the religion is one, that if this happens from you, he should overlook the matter you are in; this is part of it,And the second part: if they reconcile between them, he says: slaughter for him, you slaughter a sacrificial animal,Or the like, meaning: to appease him so that he does not continue in anger or the like, so what is the ruling on these customs?
All of this is invalid and a ruling by other than what Allah has revealed.