According to the Seder Hadorot, Balbira and Kalmana were the respective wives and twin sisters of Cain and Abel.[1][2] In an effort to explain where Cain and Abel acquired wives, some traditional sources write that each child of Adam and Eve was born with a twin who became their mate. According to the Seder HaDorot, the wife and twin sister of Cain was named Kalmana and the wife and twin of Abel was Balbira.[1]
The sister of Cain is already named Kalmana in the Apocalypse of Pseudo-Methodius (first Greek redaction) II.1.,[3] and Calmana in the Golden Legend.
In the Book of Jubilees IV, they are named as Azura and Awan.[4]