Abraham (originally Abram) is the common patriarch of the Abrahamic religions, including Judaism, Christianity, and Islam. In Judaism, he is the founding father of the covenant of the pieces, the special relationship between the Hebrews and God; in Christianity, he is the spiritual progenitor of all believers, Jewish or Gentile; and in Islam he is seen as a link in the chain of prophets that begins with Adam and culminates in Muhammad. The narrative in the Book of Genesis revolves around the themes of posterity and land. Abraham is called by God to leave the house of his father Terah and settle in the land originally given to Canaan but which God now promises to Abraham and his progeny. Various candidates are put forward who might inherit the land after Abraham; and, while promises are made to Ishmael about founding a great nation, Isaac, Abraham's son by his half-sister Sarah, inherits God's promises to Abraham. Abraham purchases a tomb (the Cave of the Patriarchs) at Hebron