Sahih Al Bukhari Hadith Number 1736

Narrated `Abdullah bin `Amr: Allah’s Messenger (peace be upon him) stopped (for a while near the Jimar at Mina) during his last Hajj and the people started asking him questions. A man said, “Ignorantly I got my head shaved before slaughtering.” The Prophet replied, “Slaughter (now) and there is no harm in it.” Another man said, “Unknowingly I slaughtered the Hadi before doing the Rami.” The Prophet (peace be upon him) said, “Do Rami now and there is no harm in it.” So, on that day, when the Prophet (peace be upon him) was asked about anything (about the ceremonies of Hajj) done before or after (its stated time) his reply was, “Do it (now) and there is no harm.”