Sirach 28:3-13

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.
8 Abstain from strife, and thou shalt diminish thy sins: for a furious man will kindle strife,
9 A sinful man disquieteth friends, and maketh debate among them that be at peace.
10 As the matter of the fire is, so it burneth: and as a man's strength is, so is his wrath; and according to his riches his anger riseth; and the stronger they are which contend, the more they will be inflamed.
11 An hasty contention kindleth a fire: and an hasty fighting sheddeth blood.
12 If thou blow the spark, it shall burn: if thou spit upon it, it shall be quenched: and both these come out of thy mouth.
13 Curse the whisperer and doubletongued: for such have destroyed many that were at peace.

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