📖 Aisha RadhiAllahu 'anha narrated: There was no behavior more hateful to the Messenger of Allah, Muhammad SallAllahu 'alaihi wa sallam, than dishonesty (being untrustworthy and knowingly telling lies on a regular basis). A man would tell a lie when speaking in the presence of the noble Prophet Muhammad SallAllahu 'alaihi wa sallam and he SallAllahu 'alaihi wa sallam would not be satisfied until he SallAllahu 'alaihi wa sallam knew that he had repented.
Source: Sunan At-Tirmidhi 1973
Grade: Sahih (Authentic) according to Al-Albani