Sirach 23:13-15

New Revised Standard Version, Anglicised

¹³ Do not accustom your mouth to coarse, foul language,
    for it involves sinful speech.
¹⁴ Remember your father and mother
    when you sit among the great,
or you may forget yourself in their presence,
    and behave like a fool through bad habit;
then you will wish that you had never been born,
    and you will curse the day of your birth.
¹⁵ Those who are accustomed to using abusive language
    will never become disciplined as long as they live.