New International Version
This is what the LORD Almighty says:
‘I will punish the Amalekites for what they did to Israel when they waylaid them as they came up from Egypt. 3 Now go, attack the Amalekites and totally destroy everything that belongs to them. Do not spare them; put to death men and women, children and infants, cattle and sheep, camels and donkeys.’
http://www.biblegateway.com/passage/?search=1+Samuel+15%3A2-3&version=NIV
But I say to you, whoever is angry with his brother will be liable to judgment, and whoever says to his brother, 'Raqa,' will be answerable to the Sanhedrin, and whoever says, 'You fool,' will be liable to fiery Gehenna.
Matthew 5:22