Abraham was a Jewish leader in the 2nd millennium BCE. Regarded as the first patriarch of the people of Israel, his teachings are accepted by three faiths - Judaism, Christianity, and Islam.
Shri Mataji Nirmala Devi has described Abraham as being an incarnation of the Primordial Master (eg. 1979-1202) who "had problems of talking to people who were really very, very ignorant." (1989-0524):
Abraham had a son. One son he had after a long time. And God asked him that he should sacrifice his son. His wife said, 'I also was feeling terrible that he has to sacrifice his son.' So he went down to the place where the child was to be sacrificed. He made a fire, everything and he was about to put the child on that pyre of fire when the voice came: 'This is Mahakali, you don’t have to sacrifice your child.' (1993-0711)
Bibliography: 'Abraham', Encyclopedia Judaica (Jerusalem: Keter, 1971) v2:111-125; Bruce S.Feiler, Abraham: a journey to the heart of three faiths (New York: W.Morrow, 2002); Genesis 11:26 to 25:10; Jon Douglas Levinson, Inheriting Abraham: the legacy of the patriarch in Judaism, Christianity, and Islam (Princeton: Princeton University Press, 2012); John Van Seters, Abraham in history and tradition (New Haven, CT: Yale University Press, 1975)