It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) was asked questions during the Farewell Hajj, and a man said: O Messenger of Allah! I slaughtered before stoning. He (peace and blessings be upon him) gestured with his hand and said: "There is no harm." On that day, whatever he was asked about doing something earlier or later, he (peace and blessings be upon him) gestured with his hand and said the same: "There is no harm."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11820