Deuteronomy 13:6

“If thy brother, the son of thy mother, etc.] A brother by mother’s side, which is generally supposed to be the nearest relation, at least most out of question, so more liable to be regarded as being beloved: or thy son, or thy daughter, or the wife of thy bosom; most dearly beloved by him, as indeed each of these relations are by a man, there being none nearer or dearer to him: or thy friend, which [is] as thine own soul; as dear to him as himself, and so strictly united in friendship, as if one soul dwelt in two bodies; such close friends were Jonathan and David, (<091801>1 Samuel 18:1). Some Jewish writers think the father is not mentioned, because of the reverence of him, with which all…”

“WITHOUT REGARD TO NEARNESS OF RELATION. (Deu 13:6-18) If thy brother . . . entice thee secretly--This term being applied very loosely in all Eastern countries (Gen 20:13), other expressions are added to intimate that no degree of kindred, however intimate, should be allowed to screen an enticer to idolatry, to conceal his crime, or protect his person. Piety and duty must overcome affection or compassion, and an accusation must be lodged before a magistrate.”

“If thy brother, the son of thy mother, or thy son, or thy daughter, or the wife of thy bosom, or thy friend, which is as thine own soul, entice thee secretly, saying, Let us go and serve other gods, which thou hast not known, thou, nor thy fathers; return to 'Top of Page'”

“The son of thy mother - This is added, to restrain the signification of the word brother, which is often used generally for one near a - kin, and to express the nearness of the relation, the mother's, side being usually the ground of the most fervent affection. Thy daughter - Thy piety must overcome both thy affection, and thy compassion to the weaker sex. The father and mother are here omitted, because they are sufficiently contained in the former examples. Deuteronomy 13:8”

“13:6 neither you nor your ancestors have known: The Israelites had heard of these false gods before, but they had never worshiped them. Doing so would violate the first two commandments, the essence of the covenant.”

“thy brother: Deu 17:2, Deu 17:3, Deu 28:54; Gen 16:5; Pro 5:20, Pro 18:24; Mic 7:5-7; Mat 12:48-50; Co2 5:16 which is: Sa1 18:1, Sa1 18:3, Sa1 20:17; Sa2 1:26 entice: Job 31:27; Gal 2:4; Eph 4:14; Col 2:4; Pe2 2:1; Jo1 2:26, Jo1 2:27; Rev 12:9; Rev 13:14, Rev 20:3 which thou: Deu 32:16-18; Jdg 2:13, Jdg 5:8, Jdg 10:6; Kg1 11:5-7; Kg2 17:30, Kg2 17:31 Deuteronomy 13:8”