(1) بَابُ مَا جَاءَ فِي إِجَازَةِ خَبَرِ الْوَاحِدِ الصَّدُوقِ فِي الأَذَانِ وَالصَّلاَةِ وَالصَّوْمِ وَالْفَرَائِضِ وَالأَحْكَامِ
Narrated Hudhaifa:
The Prophet (ﷺ) said to the people of Najran, "I will send to you an honest person who is really trustworthy." The Companion, of the Prophet (ﷺ) each desired to be that person, but the Prophet (ﷺ) sent Abu 'Ubaida.
Reference: Sahih al-Bukhari 7254
In-book reference: Book 95, Hadith 9
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 91, Hadith 360