Yahya related to me from Malik from Nafi that if Abdullah ibnUmar had finished the fast of Ramadan and intended to do hajj, hewould not cut his hair or beard at all until he had done hajj.Malik said, "It is not necessary for people to do the same."
USC-MSA web (English) reference: Book 20, Hadith 195
Arabic reference: Book 20, Hadith 894