Disciples should not resist the violent attacks of their opponents. The attack may be an insult (cf. Matthew 5:39) or a violent punch on the jaw (Gr. siagon). [1] In either case, this is an attack on the disciple"s person. An attack against his family members might require their defense, though not with more than defensive action against the attacker. Disciples need to guard themselves against pride that sometimes masquerades as chivalry while at the same time defending those in their care and trying not to overreact against the attacker. [source][source][source]
Taking the outer cloak (Gr. himation) implies that the setting is a street robbery. In legal disputes the undergarment (Gr. chiton, cf. Matthew 5:40) more often went to the victor. Luke pictured a robber taking an outer garment. The person being attacked should offer the robber his undergarment (undershirt) also. Matthew conversely pictured a lawsuit in which an enemy sues the disciple for his undergarment and the disciple offers his outer garment. In this whole section, Luke described what was more typical in the Gentile world and Matthew what was more common among Jews. [source][source][source]
"The Christian should never refrain from giving out of a love for his possessions." [2][source]
"The teaching of the passage as a whole relates not so much to passivity in the face of evil as to concern for the other person." [3][source]
In refraining from doing evil the disciple may suffer evil. This is how Jesus behaved and what He experienced ( Luke 23:34; cf. 1 Peter 2:20-24). It is what He taught His disciples to do and to expect too. [source][source][source]