Yahya related to me from Malik from Nafi that when Abdullah ibnUmar gave something in the way of Allah, he would say to its owner,"When you reach Wadi'l-Qura, (on the outskirts of Madina) then it isyour affair."
USC-MSA web (English) reference: Book 21, Hadith 13
Arabic reference: Book 21, Hadith 974