Sirach 28:1-5
{28:1} Whoever wishes for vengeance will find vengeance from the Lord, and he will surely be attentive to his sins.
{28:2} Forgive your neighbor, if he has harmed you, and then your sins will be forgiven you when you pray.
{28:3} A man holds on to anger against another man, and does he then seek a remedy from God?
{28:4} He has no mercy on a man like himself, and does he then entreat for his own sins?
{28:5} He who is but flesh holds on to anger, and does he then request forgiveness from God? Who can obtain pardon for his sins in this way?
Sirach 27:31-33
{27:31} Mockery and derision are of the arrogant, and vengeance will lie in wait for them, like a lion.
{27:32} Whoever enjoys the fall of the just will perish in a snare, and grief will consume them before they die.
{27:33} Anger and fury are both abominable, and the sinful man will be held by them.