Monks working in monasteries 8,000 feet above the Red Sea preserved the First Book of Adam and Eve. They copied the text in Ge'ez on dried animal skins. The narrative survives exclusively through these Ethiopian manuscripts. Philological evidence anchors the original Syriac composition along the Orontes River during the fifth century a.d.
This late antique text constructs rigid social laws to explain early human expansion. Chapter 73 codifies a specific marriage arrangement to solve the problem of propagation. Adam commands Cain to marry Abel's twin sister Aklia. Abel must marry Cain's twin sister Luluwa. The authors built this framework to isolate early humanity from Gentile populations or outside influence.
Cain rejects this decree based entirely on physical appearance. He demands his own twin sister Luluwa because she possesses superior beauty. The text situates this domestic dispute on the harsh mountain slopes below the Cave of Treasures. The terrain drops sharply to the lower valleys where the siblings tend their sheep and harvest crops.
Physical desire for a sibling breeds the first human violence.
This incestuous demand establishes a lethal trajectory for the family. Adam attempts to enforce the cross-marriage to maintain order and obey God. Cain refuses to submit to his father or his maker. His absolute rejection of the arrangement guarantees the upcoming slaughter in the fields.