Uttering curses is a very delicate and dangerous issue in Islam. One should be careful not to incur the curse of someone and one should also be careful about uttering a curse, for a curse is something that takes its effect. If the person is deserving of the curse, it will affect him/her and if the person is not truly deserving of the curse, it will rebound on to the one who has uttered the curse and it will affect him/her.
Sayyiduna Abud Dardaa’ (Radiyallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said:
“When a person utters a curse, it ascends to the sky and the doors of the sky are shut on it, then it descends to the earth and the doors of the earth are shut on it, then it goes to the right and left, looking for a way to escape but it cannot escape. So it then goes to the one who has been cursed. If the person is deserving of the curse, it afflicts him/her and if the person is not deserving of the curse, it rebounds onto the one who has uttered the curse and afflicts him/her” (Abu Dawood, Hadith #: 4905)
And Allah Knows Best
Mufti Suhail Tarmahomed