(3) باب الْحَالِ الَّتِي يُسْتَحَبُّ لِلإِمَامِ أَنْ يَكُونَ عَلَيْهَا إِذَا خَرَجَ
It was narrated from Abdullah bin Zaid that:
The Messenger of Allah (ﷺ) prayed for rain wearing a black khamisah.
Reference: Sunan an-Nasa'i 1507
In-book reference: Book 17, Hadith 4
English translation: Vol. 2, Book 17, Hadith 1508