"Did you bring it down from the clouds?" [a-antum anzaltumuhu min al-muzni]—meaning: from the clouds (al-sahab).
Muhammad said: Its singular is muznah.
﴿أَأَنتُمْ أَنزَلْتُمُوهُ مِنَ الْمُزْنِ﴾ من السَّحَاب.
قَالَ محمدٌ: وَاحِدهَا مزنة.