The Prophet of Islam in another tradition is quoted to have said,
“When a believer utters a lie without a valid excuse, he is cursed by seventy thousand angels. Such a stench emanates from his heart that it reaches the sky and because of this single lie Allah writes for him a sin equivalent to that of committing seventy fornications. Such fornications that the least of which is fornication with ones mother.”
(Mustadrak ul-Wasa’il)