(9) باب الاِتِّقَاءِ وَالْحَذَرِ مِنْ دَعْوَةِ الْمَظْلُومِ
Narrated Ibn `Abbas:
The Prophet (ﷺ) sent Mu`adh to Yemen and said, "Be afraid, from the curse of the oppressed as there is no screen between his invocation and Allah."
Reference: Sahih al-Bukhari 2448
In-book reference: Book 46, Hadith 9
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 43, Hadith 628