Is the belief that the chirping of a certain bird indicates the arrival of a guest from travel—a belief that is inherited and always proves true—forbidden or permissible?

This belief has no sound basis, and it is feared that it contains an element of believing in omens (bird augury), which is religiously condemned. Optimism and pessimism based on birds are blameworthy, and by extension, it is even more blameworthy to believe in the truth of an illusion that these birds convey information about unseen future matters.