Sirach 28:1-7

1 He that revengeth shall find vengeance from the Lord, and he will surely keep his sins
2 Forgive thy neighbour the hurt that he hath done unto thee, so shall thy sins also be forgiven when thou prayest.
3 One man beareth hatred against another, and doth he seek pardon from the Lord?
4 He sheweth no mercy to a man, which is like himself: and doth he ask forgiveness of his own sins?
5 If he that is but flesh nourish hatred, who will intreat for pardon of his sins?
6 Remember thy end, and let enmity cease; corruption and death, and abide in the commandments.
7 Remember the commandments, and bear no malice to thy neighbour: the covenant of the Highest, and wink at ignorance.

The Brenton translation of the Septuagint is in the public domain.