Azura (also Aclima or Balbira) was the daughter of Adam and Eve, the twin of Abel, and both the wife and sister of Seth, as described in chapter 4 of the Book of Jubilees.
[1][2] In an effort to explain where Cain and Abel acquired wives, some traditional sources stated that each child of Adam and Eve was born with a twin who became their mate.
Adam proposed to refer the question to God by means of a sacrifice, and God rejected Cain's sacrifice, signifying his disapproval of Cain's marriage to Aclima.
[3][4][5] Some sources in the Eastern Orthodox traditions give the name Azura to Cain's twin sister.
[7] In the Jewish work Seder Hadorot, Abel's twin sister is called Balbira.