Mark 3:17

3:17 to James and his brother John, the sons of Zebedee, he gave the name Boanerges (that is, “sons of thunder”);

Mark 6:18

6:18 For John had repeatedly told Herod, “It is not lawful for you to have your brother’s wife.”

tn Grk “to James, the son of Zebedee, and John, the brother of James.”

tn The imperfect tense verb is here rendered with an iterative force.

sn It is not lawful for you to have your brother’s wife. This was a violation of OT law (Lev 18:16; 20:21). In addition, both Herod Antipas and Herodias had each left marriages to enter into this union.