Sirach 23:7–15

Hear, O ye children, the discipline of the mouth, and he that will keep it shall not perish by his lips, nor be brought to fall into most wicked works. 8A sinner is caught in his own vanity, and the proud and the evil speakers shall fall thereby. 9Let not thy mouth be accustomed to swearing: for in it there are many falls. 10And let not the naming of God be usual in thy mouth, and meddle not with the names of saints, for thou shalt not escape free from them. 11For as a slave daily put to the question, is never without a blue mark: so every one that sweareth, and nameth, shall not be wholly pure from sin. 12A man that sweareth much, shall be filled with iniquity, and a scourge shall not depart from his house. 13And if he make it void, his sin shall be upon him, and if he dissemble it, he offendeth double: 14And if he swear in vain, he shall not be justified: for his house shall be filled with his punishment. 15There is also another speech opposite to death, let it not be found in the inheritance of Jacob.