Sahih al-Bukhari, Hadith 4162 ⓘ

Narrated Sa`id bin Al-Musaiyab: That his father said, "I saw the Tree (of the Ar-Ridwan Pledge of allegiance and when I returned to it later, I was not able to recognize it. (The sub--narrator MahmiJd said, Al-Musaiyab said, 'Then; forgot it (i.e., the Tree).)"

حَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا شَبَابَةُ بْنُ سَوَّارٍ أَبُو عَمْرٍو الْفَزَارِيُّ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِيهِ، قَالَ لَقَدْ رَأَيْتُ الشَّجَرَةَ، ثُمَّ أَتَيْتُهَا بَعْدُ فَلَمْ أَعْرِفْهَا‏.‏ قَالَ مَحْمُودٌ ثُمَّ أُنْسِيتُهَا بَعْدُ‏.‏