From Beyond the Grave

From Beyond the Grave is a 1974 British anthology horror film from Amicus Productions, directed by horror director Kevin Connor, produced by Milton Subotsky and based on stories by R. ChetwyndHayes

Four customers purchase or take items from Temptations Limited, an antiques shop whose motto is Offers You Cannot Resist. A nasty fate awaits those who cheat the shops Proprietor Peter Cushing.Edward Charlton David Warner purchases an antique mirror for a knockdown price, having tricked the Proprietor into believing it is a reproduction. When he takes it home, Charlton holds a sance at the suggestion of his friends, and falls into a trance. He finds himself in a netherworld where he is approached by a sinister figure Marcel Steiner. The figure appears to stab him, and Charlton awakes screaming. Later, the figures face appears in the mirror and orders Charlton to kill so that he can feed. Charlton butchers people until the apparition is able to manifest himself outside of the mirror. The figure then explains that Charlton must do one more thing before the figure can walk abroad and join the others like him. The figure says he will take Charlton beyond the ultimate, and persuades Charlton to kill himself by impaling himself on a knife. The mirror stays in Charltons flat for years after his death, until the latest owner also decides to hold a sance. Once the sance starts, Charltons hungry spectre appears in the mirror. ........

Source: Wikipedia