People used to come to the tree known as the Tree of Ridwan and pray beside it. When this reached Umar bin Khattab, he warned them against doing so and ordered the tree to be cut down, and it was cut down.
كان الناس يأتون الشجرة التي يقال لها شجرة الرضوان فيصلون عندها، قال: فبلغ ذلك عمر بن الخطاب فأوعدهم فيها، وأمر بها فقطعت.
Ibn Saad narrated it in his Tabaqat (2/100), from Abdul-Wahhab bin Ata, Abdullah bin Awn informed us, from Nafi, and he mentioned it. Its chain of transmission is sahih. Hafiz also declared it sahih in Fath al-Bari (7/448).So the statement of Saad bin Musayab, "The companions of Muhammadﷺ did not know it, yet you have come to know it," contains rebuke and mockery, for the tree had already been ordered cut down by Umar bin Khattab, so where is it now? As for the location of the tree, Jabir bin Abdullah used to know it precisely, but he went blind and could no longer point it out.