In his letters, the apostle Paul commonly refers to his fellow believers as "adelfoi," as his "brothers and sisters." Here, Reidar Aasgaard offers the first in-depth, and by far the most profound, analysis of this sibling vocabulary in the Pauline epistles.

Aasgaard researches family and sibling relationships in the Graeco-Roman and Jewish context and discusses the relevant texts on siblingship in Paul's letters. He argues that sibling terminology is both central and charged with meaning for Paul. When the apostle speaks of the Christians as siblings, he employs contemporary notions...