Mukhtasar Muslim

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: Avoid the two acts that bring curses (i.e., those because of which people curse you). The people asked: What are the two acts that bring curses? He (peace be upon him) said: One is relieving oneself on the road (where people pass by), and the other is relieving oneself in a shaded place (where people sit and rest). (Both of these acts cause harm to people, and they will speak ill and curse.)