Brother

A brother is a male sibling by birth, and the word then extends to a close kinsman or a fellow member of the community of faith; as a matter of language, the Hebrew ʾach and the Greek adelphos both carry this double range, so context decides which sense is in view.

Scripture uses the term first for literal family. Genesis 45:5 and Genesis 50:20 record Joseph telling his brothers that they meant evil against him but God meant it for good, to preserve life, and Genesis 50:24 has him speak to “my brothers” about the oath sworn to Abraham, Isaac, and Jacob. The same word is already stretched wider, though: Genesis 9:5 places the bloodguilt of human life “at the hand of every man’s brother,” which reads as a claim about human beings generally and not about siblings alone. Leviticus 19:17 sets “your brother” alongside “your neighbor” in a command against inward hatred and in favor of honest rebuke, so that the brother is the person to whom one is bound in covenant obligation.

In the New Testament the word becomes both a common address among disciples and a deliberate redefining of family. Matthew 12:50 makes doing the will of the Father the ground of being brother, sister, and mother to Jesus; Matthew 18:35 makes forgiveness of “your brother” from the heart the measure of the Father’s forgiveness; Matthew 25:40 identifies “the least of these my brothers” with the King himself. Ananias greets the newly convinced Saul as “Brother Saul” (Acts 9:17), Hebrews 2:11 says the one who sanctifies is not ashamed to call the sanctified brothers, and 1 Peter 1:22 urges sincere brotherly affection and fervent love. 1 John 3:15 presses the claim hardest, treating hatred of a brother as murder.

Christian traditions differ over how far this familial language should be institutionalized. Catholic and Orthodox practice uses “brother” as a formal title for monks and religious and as a standard address among the baptized; many Protestant bodies use it for fellow believers and congregation members, stressing the spiritual family of Matthew 12:50 while still honoring biological kinship; Anabaptist and Brethren-type churches have built communal identity around it. Interpreters also disagree over how literally to take the New Testament’s references to the brothers of Jesus — some reading them as siblings, others as near kin — and that disagreement shapes how each tradition holds the literal and the extended senses together.

AI-generated reference entry, grounded in the passages where this term appears — history and Scripture stated as such, interpretation labeled as interpretation. Not a substitute for the text itself.