Under the New Testiment, is it wrong to stand up for a loved one. That is, if they are under a threat.
Example: A man hits your wife, from that point (biblically) what should you do? (Under New Convenient)
Please back up statements with scripture.
Exodus 22:2-3 tells us that an intruder can be killed when it is likely he's come to kill or at least ready to do violence (breaking and entering at night, when residents can be expected to be home), while an intruder come to steal, not expecting a confrontation with residents (during daylight, when residents can be expected to be absent) should not be. The legal principle there establishes that the perceived intent of the intruder must be taken into account. In other words, if you have a reasonable fear for your life then homicide is justified.
Luke 22:36-39 tells us that Jesus approved of being armed and capable of defending oneself when appropriate. Foreseeing the need for armed defense, He instructed His followers to arm themselves.
Proverbs 25:21-22 and Romans 12:17 tell us not repay evil with evil, but to bless our enemies. Note that these verses establish, if not specifically, that once an evil has been done it is not your place to take vengeance, so these are
not proscriptions against defense.
Matthew 5:39 instructs us to turn the other cheek, but a strike on the cheek is presented here as an insult, not as an act of violence and certainly not a deadly one nor one that can reasonably be perceived as such. Here we are instructed to absorb or ignore
insults, even a smack on the cheek, not deadly violence nor even violence that may cause injury. A slap on the cheek risks neither. It's presented purely as a powerful and evocative example of insult, not as a violent act.
In Matthew 26:51-54 we see Jesus rebuke Peter for striking out at the Roman guards, but this was for two reasons. One, interfering with Jesus being taken into custody would interfere with God's plan. Two, Peter committed a crime by attacking the guards, who were doing their jobs. Peter would have faced charges and been executed. Dying by the sword, so to speak, for having wielded the sword contrary to the law, just as Jesus pointed out to him.
So...
Where does the New Testament specifically grant the right to defense and self defense?
Nowhere. Nor does it speak against it. It's assumed, as verses throughout the bible clearly show.