Yahya related to me from Malik from Nafi that Abdullah ibn Umarused to send the zakat al-fitr to the one with whom it was collectedtogether two or three days before the day of breaking the fast. (RU)
USC-MSA web (English) reference: Book 17, Hadith 56 (RU)
Arabic reference (RU): Book 17, Hadith 632 (RU)