And He says:

“His people came rushing towards him; before this, they had been committing evil deeds.”
[Surah Hūd 78]

And He says:

“We saved him from the town that practised foul deeds.”
[Surah al-Anbiyāʾ 74]

And He says:

“My Lord, help me against the people who spread corruption.”
[Surah al-ʿAnkabūt 30]

And He says:

“We rained down upon them a rain. See, then, what was the end of the criminals!”
[Surah al-Aʿrāf 84]

What is obscene and foul is the opposite of what is good and beautiful. When something is of this kind, Allah hates it and does not love it, and it does not fall within the category of the beautiful.

Similar to this is the Prophet’s saying, may Allah bless him and grant him peace:

“Allah does not love obscenity or deliberate indecency.”

And his saying:

“Allah hates the obscene, foul-mouthed person.”

Thus, if one were to speak obscenely