1 Peter 3:9

Do not repay evil with evil or insult with insult, but with blessing, because to this you were called so that you may inherit a blessing.

Do not repay evil with evil
Romans 12:17-21 Do not repay anyone evil for evil. Be careful to do what is right in the eyes of everybody. If it is possible, as far as it depends on you, live at peace with everyone. Do not take revenge, my friends, but leave room for God's wrath, for it is written: "It is mine to avenge; I will repay," says the Lord. On the contrary: "If your enemy is hungry, feed him; if he is thirsty, give him something to drink. In doing this, you will heap burning coals on his head." Do not be overcome by evil, but overcome evil with good.
1 Thessalonians 5:15 Make sure that nobody pays back wrong for wrong, but always try to be kind to each other and to everyone else.

or insult with insult
1 Peter 2:23 When they hurled their insults at him, he did not retaliate; when he suffered, he made no threats. Instead, he entrusted himself to him who judges justly.

but with blessing
Matthew 5:44 "But I tell you: Love your enemies and pray for those who persecute you, ..."

because to this
1 Peter 2:21 To this you were called, because Christ suffered for you, leaving you an example, that you should follow in his steps.

you were called
Romans 8:28 And we know that in all things God works for the good of those who love him, who have been called according to his purpose.

so that you may inherit a blessing
Hebrews 6:14 ...saying, "I will surely bless you and give you many descendants."

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.