Because of his sins against Man.
because he just did
These were people like Marley who were destined to walk the earth for eternity in torment
Jacobs return was the start of the changes that Scrooge was to undertake before Christmas Day. Marley tells Scrooge that he (Marley) will walk the earth for eternity because of his attitude to his fellow man. It was a punishment that he did not want Scrooge to endure
It is Christmas Eve 1843 and Jacob Marley who was Scrooges only friend and business partner has been death 7 years that very night. Marley Returns as a ghost to warn Scrooge that his life is likely to end and because of the way he lived that life he may walk the earth for eternity never finding peace.
Due to his ignorance to the plight of mankind around him and the fact that he did not try in anyway to help those less fortunate than himself he was bound to walk the earth in everlasting torment
Marley's ghost appears to warn Scrooge about his miserly ways and to offer him a chance at redemption. Marley's spirit serves as a messenger to help Scrooge see the consequences of his actions and the opportunity to change his fate.
In "A Christmas Carol," the term "walk-er" refers to a ghost or spirit that is doomed to wander the earth in torment. The character Jacob Marley, for example, is described as a "walk-er" because he is condemned to roam the earth wearing heavy chains as punishment for his past sins. This term is used to convey the idea of eternal suffering and the consequences of leading a selfish and greedy life.
The grave is that of Scrooge who if he does not changes his ways quickly will die a lonely man destined to walk the earth for eternity
Jacob Marley was consumed by greed and selfishness when he was alive. He mistreated others, neglected his responsibilities, and put his own interests above everything else. This ultimately led to his lonely and tormented existence as a ghost in "A Christmas Carol" by Charles Dickens.
Its areas where Scrooge is given warnings of what may happen. This is especially important in Stave 1 when Marley tells Scrooge that his fate thus far was to walk the earth in torment for eternity and in stave 4 when teh Ghost of Chreistmas Yet to Come shows Scrooge the visons of what might be , in this case Scrooges death
After his death he will walk the earth as a ghost in eternal torment
The people would see him and remember that Jesus made beggars walk