Ben Sira 23:9

9 Accustom not thy mouth to swearing; neither use thyself to the naming of the Holy One.

Ben Sira 23:9 In-Context

7 Hear, O ye children, the discipline of the mouth: he that keepeth it shall never be taken in his lips.
8 The sinner shall be left in his foolishness: both the evil speaker and the proud shall fall thereby.
9 Accustom not thy mouth to swearing; neither use thyself to the naming of the Holy One.
10 For as a servant that is continually beaten shall not be without a blue mark: so he that sweareth and nameth God continually shall not be faultless.
11 A man that useth much swearing shall be filled with iniquity, and the plague shall never depart from his house: if he shall offend, his sin shall be upon him: and if he acknowledge not his sin, he maketh a double offence: and if he swear in vain, he shall not be innocent, but his house shall be full of calamities.
The King James Version is in the public domain.