The Messenger of Allah ﷺ performed the sacrifice, then shaved his head and sat down for the people. He was not asked about anything except that he said, "No harm, no harm."Then a man came to him and said, "I shaved before I sacrificed."He replied, "No harm."Then another man came and said, "Messenger of Allah, I shaved before I stoned."He replied, "No harm."The Messenger of Allah ﷺ said, "All of Arafah is a standing place, all of Muzdalifa is a standing place, all of Mina is a place of sacrifice, and every pathway of Makkah is a route and a place of sacrifice."
حدثنا عثمان بن عمر حدثنا أسامة عن عطاء
نحر رسول الله ﷺ فحلق وجلس للناس فما سئل عن شيء إلا قال لا حرج لا حرج حتى جاءه رجل فقال حلقت قبل أن أنحر قال لا حرج ثم جاء آخر فقال يا رسول الله حلقت قبل أن أرمي قال لا حرج قال رسول الله ﷺ عرفة كلها موقف والمزدلفة كلها موقف ومنى كلها منحر وكل فجاج مكة طريق ومنحر
Its isnad is sahih. Abu Khaythama is Zuhayr bin Harb Baghdadi, originally from Nasa, and he was trustworthy and firm. The hadith was narrated by the leading scholars. Bukhari narrated it in 1/31, in the Book of Knowledge, chapter "Issuing a Fatwa While Standing," Muslim narrated it in the Book of Hajj, 2/893, Abu Dawud in 1983, Nasai in 5/272, number 3067, and Ibn Majah in 3050.