Mentioning the name al-Darr (the Harmer) among the names of Allah

The questioner:
May Allah bless you. Among the questions that reached us, this questioner says: Is al-Darr (the Harmer) mentioned as a name, an action, or a description of Allah the Exalted in the Book or the Sunnah?

The Shaykh:
It is mentioned in the Sunnah. Al-Darr (the Harmer) is among the names of Allah. Al-Darr al-Nafi' (the Harmer, the Beneficial). What do you say? Just al-Darr? You say al-Darr al-Nafi'. This is in the Sunnah, yes.

The presenter:
Meaning, is it a name or a description? A name. May Allah bless you. Also, among the questions that reached us, this questioner says: Is it permissible to swear by an attribute of Allah the Exalted, such as saying "By the majesty of Allah," "By the mercy of Allah," or "By the speech of Allah"?

The Shaykh:
Yes, yes. It is permissible to swear by an attribute, just as it is permissible to swear by a name among the names of Allah, yes.