Simply let your 'Yes' be 'Yes,' and your 'No,' 'No';1 anything beyond this comes from the evil one.2
References for Matthew 5:37
"You have heard that it was said, 'Eye for eye, and tooth for tooth.'3
References for Matthew 5:38
But I tell you, Do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also.4
References for Matthew 5:39
And if someone wants to sue you and take your tunic, let him have your cloak as well.
If someone forces you to go one mile, go with him two miles.
Give to the one who asks you, and do not turn away from the one who wants to borrow from you.5
References for Matthew 5:42
"You have heard that it was said, 'Love your neighbor6 and hate your enemy.'7
References for Matthew 5:43
But I tell you: Love your enemies and pray for those who persecute you,8
References for Matthew 5:44
that you may be sons9 of your Father in heaven. He causes his sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous.10
References for Matthew 5:45
If you love those who love you, what reward will you get?11 Are not even the tax collectors doing that?
References for Matthew 5:46
And if you greet only your brothers, what are you doing more than others? Do not even pagans do that?