Sahih Bukhari Volume 2, Book 26, Hadith Number 780.

Narated By Ibn Abbas : A man said to the Prophet “I performed the Tawaf-al-Ifada before the Rami (throwing pebbles at the Jamra).” The Prophet replied, “There is no harm.” The man said, “I had my head shaved before slaughtering.” The Prophet replied, “There is no harm.” He said, “I have slaughtered the Hadi before the Rami.” The Prophet replied, “There is no harm.”