Al-Mughira ibn Shu'ba reported that a man said, "May Allah makethe amir thrive! Your chamberlain recognises certain men and gives thempreference in permission to enter." He said, "May Allah excuse him! Recognitionhelps with a voracious good and attacking camel."
English reference: Book 55, Hadith 1296
Arabic reference: Book 1, Hadith 1296