From the Book of Luke:
"But to you who hear I say, love your enemies, do good to those who hate you,
bless those who curse you, pray for those who mistreat you.
To the person who strikes you on one cheek, offer the other one as well, and from the person who takes your cloak, do not withhold even your tunic.
Give to everyone who asks of you, and from the one who takes what is yours do not demand it back.
Do to others as you would have them do to you.
For if you love those who love you, what credit is that to you? Even sinners love those who love them.
And if you do good to those who do good to you, what credit is that to you? Even sinners do the same.
If you lend money to those from whom you expect repayment, what credit (is) that to you? Even sinners lend to sinners, and get back the same amount.
But rather, love your enemies and do good to them, and lend expecting nothing back; then your reward will be great and you will be children of the Most High, for he himself is kind to the ungrateful and the wicked.
Be merciful, just as (also) your Father is merciful.