Abraham was a rich man. It is not inherently evil to be rich. He had servants (Word for Slaves). In some parts of the bible, like the story of Ruth gleaming grain after the harvest (Something poor people did to get food), and the master "Boaz" of the servants told the servants to drop a little so she could feed herself and her mother. This story is in the book of RUTH. It is very interesting because it shows that customs of the Jews are much different than our customs. It also shows that they cared about their servants and their distant relatives.
Some may not understand why they bothered with putting this as a book in the bible in a male patriarchal bible. Jesus line of ancestry is through Ruth, because of how jewish customs work, and how men were resposnible for raising up children for their deceased male family relations.