Sahih Bukhari Volume 003, Book 035, Hadith Number 460.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 35. Sales in Which a Price is paid for Goods to be Delivered later (As-Salam)
Narated By 'Aisha : I said, "O Allah's Apostle! I have two neighbors and would like to know to which of them I should give presents." He replied, "To the one whose door is nearer to you."