General Behavior (Kitab Al-Adab)
Dawud :: Book 41 : Hadith 5219
Narrated Dukayn ibn Sa'id al-Muzani:
We came to the Prophet (peace_be_upon_him) and asked him for some corn. He said: Go, Umar, and give them. He ascended with us a room upstairs, took a key from his apartment and opened it.