I saw the Prophet (ﷺ) near the Jamra and the people were asking him questions (about religious
problems). A man asked, "O Allah's Messenger (ﷺ)! I have slaughtered the Hadi (animal) before doing the
Rami." The Prophet (ﷺ) replied, "Do the Rami (now) and there is no harm." Another person asked, "O
Allah's Messenger (ﷺ)! I got my head shaved before slaughtering the animal." The Prophet (ﷺ) replied, "Do the
slaughtering (now) and there is no harm." So on that day, when the Prophet (ﷺ) was asked about anything
as regards the ceremonies of Hajj performed before or after its due time his reply was, "Do it (now)
and there is no harm."
Sahih al-Bukhari Book 3, Hadith 66