"Be Ye Clean," Ensign, May 1996, p. 48:

"Be clean in language. There is so much of filthy, sleazy talk these
days. I spoke to the young women about it. I speak to you also. It tells
others that your vocabulary is so extremely limited that you cannot
express yourselves without reaching down into the gutter for words.
Dirty talk is unbecoming any man who holds the priesthood, be he young
or old.

Nor can you as a priesthood holder take the name of the Lord in vain.
Said Jehovah to the children of Israel, 'Thou shall not take the name of
the Lord thy God in vain; for the Lord will not hold him guiltless that
taketh his name in vain' (Ex. 20:7).

That commandment, engraved by the finger of the Lord, is as binding
upon us as it was upon those to whom it was originally given. The Lord
has said in modern revelation, 'Remember that that which cometh from
above is sacred, and must be spoken with care, and by constraint of the
Spirit' (D & C 63:64).

A filthy mind expresses itself in filthy and profane language. A clean
mind expresses itself in language that is positive and uplifting and in deeds
that bring happiness into the heart."

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In a conference talk in 1987 when he was First Counselor in the First
Presidency, President Gordon B. Hinckley reported that in our society such
profanity is becoming all too prevalent. He read from a First Presidency
general epistle issued a hundred years earlier, dated 8 April 1887 which
stated: "The habit..., which some young people fall into of using vulgarity
and profanity...is not only offensive to well-bred persons, but it is a gross
sin in the sight of God, and should not exist among the children of Latter-
day Saints."

In addition President Hinckley recounted the story of the son of the
Israelitish woman who was stoned to death for blasphemy (see Leviticus
16) and said "While that most serious of penalties has long since ceased
to be inflicted, the gravity of the sin has not changed."

(from the book: The Ten Commandments For Today, p. 64)