It was narrated that Abut-Tufail said: We said to `Ali: Tell us of something that the Messenger of Allah (ﷺ) told you in secret. He said: He did not tell me anything in secret that he concealed from the people, but I heard him say: `May Allah curse the one who slaughters in the name of something other than Allah, may Allah curse the one who gives refuge to an offender, may Allah curse the one who curses his parents and may Allah curse the one who changes the boundary markers.”