Oaths.  Sir.23.7-11

⁷Listen, my children, to instruction concerning speech;
the one who observes it will never be caught.
⁸The sinner is overtaken through his lips,
the reviler and the arrogant are tripped by them.
⁹Do not accustom your mouth to oaths,
and do not habitually utter the name of the Holy One;
¹⁰for as a servant who is continually examined under torture will not lack bruises,
so also the man who always swears and utters the Name will not be cleansed from sin.
¹¹A man who swears many oaths will be filled with iniquity,
and the scourge will not leave his house;
if he offends, his sin remains on him,
and if he disregards it, he sins doubly;
if he has sworn needlessly, he will not be justified,
for his house will be filled with calamities.

Offensive language.  Sir.23.12-15

¹²There is an utterance which is comparable to death;
may it never be found in the inheritance of Jacob!
For all these errors will be far from the godly,
and they will not wallow in sins.
¹³Do not accustom your mouth to lewd vulgarity,
for it involves sinful speech.
¹⁴Remember your father and mother
when you sit among great men;
lest you be forgetful in their presence,
and be deemed a fool on account of your habits;
then you will wish that you had never been born,
and you will curse the day of your birth.
¹⁵A man accustomed to use insulting words
will never become disciplined all his days.

Fornication.  Sir.23.16-27

¹⁶Two sorts of men multiply sins, and a third incurs wrath.
The soul heated like a burning fire will not be quenched until it is consumed;
a man who commits fornication with his near of kin will never cease until the fire burns him up.
¹⁷To a fornicator all bread tastes sweet;
he will never cease until he dies.
¹⁸A man who breaks his marriage vows
says to himself, "Who sees me?
Darkness surrounds me, and the walls hide me, and no one sees me.
Why should I fear? The Most High will not take notice of my sins."
¹⁹His fear is confined to the eyes of men,
and he does not realize that the eyes of the Lord
are ten thousand times brighter than the sun;
they look upon all the ways of men,
and perceive even the hidden places.
²⁰Before the universe was created, it was known to him;
so it was also after it was finished.
²¹This man will be punished in the streets of the city,
and where he least suspects it, he will be seized.
²²So it is with a woman who leaves her husband
and provides an heir by a stranger.
²³For first of all, she has disobeyed the law of the Most High;
second, she has committed an offence against her husband;
and third, she has committed adultery through harlotry and brought forth children by another man.
²⁴She herself will be brought before the assembly,
and punishment will fall on her children.
²⁵Her children will not take root,
and her branches will not bear fruit.
²⁶She will leave her memory for a curse,
and her disgrace will not be blotted out.
²⁷Those who survive her will recognize
that nothing is better than the fear of the Lord,
and nothing sweeter than to heed the commandments of the Lord.