Tyndale Open Bible Dictionary

BROTHER

Man or boy in his relationship to the other children of his parents; also a close male friend or fellow member of the same race, creed, profession, organization, and the like; a kinsman.

In the OT the Hebrew word translated “brother” describes the relationship between male children who have at least one parent in common. Joseph and Benjamin were children of Jacob and Rachel (Gn 35:24), but the other sons born to Jacob are also called Joseph’s brothers (42:6). The love Joseph had for Benjamin is not always found between brothers. Cain killed his brother Abel (4:8), and Esau hated his brother, Jacob (27:41). A brother may be a bad influence (Dt 13:6-7), but ideally he is one who helps in times of need (Prv 17:17). The law of levirate marriage required that if a man died leaving a childless widow, the man’s brother had to raise up children through her to perpetuate the family name (Dt 25:5).

David spoke affectionately of his “brother” Jonathan, although they were not related (2 Sm 1:26). A fellow Israelite could be called brother. The relationship required certain obligations: money could not be loaned to a brother at interest, and a brother could not be enslaved (Lv 25:35-43).

In the NT the Greek word is used to describe natural brothers, such as Andrew and Peter (Jn 1:41). Four brothers of Jesus are named (Mk 6:3). (The Roman Catholic view is that they were really Jesus’ cousins, but the Greek language has several words for cousin, and the word “brother” is used here; thus, it refers either to children or foster children of Mary and Joseph.) Jesus’ brothers did not believe in him at first (Jn 7:5), but after the resurrection they were meeting with the Christian community (Acts 1:14). Jesus taught that his disciples had one Father (God) and were therefore brothers (Mt 23:8-9), and he graciously identified himself with the disciples as their brother (28:10).

Early in the history of the church it became customary for Christians to address one another as brother (Acts 9:17; Col 1:1); on two occasions the Christian community is called “the brotherhood” (1 Pt 2:17; 5:9, rsv). Specific duties and responsibilities accompany Christian brotherhood. A Christian’s love for his brother will be demonstrated in the restraint of sexual passions (1 Thes 4:6), provision of material goods when needed (Jas 2:15-16), and determination not to offend (Rom 14:13). A Christian must not “go to law” against a brother (1 Cor 6:5-6), but brothers must resolve their problems either personally or within the church group (Mt 18:15-17). The relationship between Christians is significant because a Christian cannot offer worship to God if he is out of harmony with his brother (Mt 5:23-24).