Lying is the worst of characteristics. Rasulullah r was asked, “Oh Messenger of Allah, does a believer fornicate?” He answered, “This might happen.” He was asked again, “Does a believer steal?” He answered, “This might happen.” He was asked again, “Does a believer lie?” He answered, “No.” Then he continued with this verse: ﴾إِنَّمَا يَفْتَرِي الْكَذِبَ الَّذِينَ لا يُؤْمِنُونَ﴿ “They only invent falsehood who do not believe in the verses of Allah, and it is those who are the liars.” [Surah An-Nahl: 105][1]
Therefore, lying is the most dangerous characteristic and it comes together with hypocrisy.