Sahih al-Bukhari 4164
Sahih al-Bukhari · Book 64: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) · The Ghazwa of Al-Hudaibiya
Narrated Sa`id bin Al-Musaiyab:
حَدَّثَنَا مُوسَى ، حَدَّثَنَا أَبُو عَوَانَةَ ، حَدَّثَنَا طَارِقٌ ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ ، عَنْ أَبِيهِ ، أَنَّهُ كَانَ مِمَّنْ بَايَعَ تَحْتَ الشَّجَرَةِ، فَرَجَعْنَا إِلَيْهَا الْعَامَ الْمُقْبِلَ فَعَمِيَتْ عَلَيْنَا.
That his father was amongst those who had given the Pledge of allegiance (to the Prophet (ﷺ) ) beneath the Tree, and the next year when they went towards the Tree, they were not able to recognize it.