Narrated Abu Hurairah:

The Prophet (sal Allaahu alayhi wa sallam ) as saying : Be on your guard against two things which provoke cursing. They (the hearers) said : Prophet (ﷺ) of Allaah ( sal Allaahu alayhi wa sallam), what are these things which provoke cursing: easing in the watering places and on the thoroughfares, and in the shade (of the tree)(where they take shelter and rest).

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ، عَنِ الْعَلاَءِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ اتَّقُوا اللاَّعِنَيْنِ ‏"‏ ‏.‏ قَالُوا وَمَا اللاَّعِنَانِ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ الَّذِي يَتَخَلَّى فِي طَرِيقِ النَّاسِ أَوْ ظِلِّهِمْ ‏"‏ ‏.‏