Hadith 1:112
At-Tabarani also narrated on the authority of Ibn ‘Umar (with a weak chain of narrators), the prohibition of relieving oneself under fruit trees and beside the bank of a flowing river.
وَأَخْرَجَ اَلطَّبَرَانِيُّ اَلنَّهْيَ عَن ْ (110) تَحْتِ اَلْأَشْجَارِ اَلْمُثْمِرَةِ, وَضَفَّةِ اَلنَّهْرِ الْجَارِي. مِنْ حَدِيثِ اِبْنِ عُمَرَ بِسَنَدٍ ضَعِيف ٍ (111)
Original Reference: Bulugh al-Maram 94