It is narrated from the prophet of Islam (PBUH) who said: There are three things (three signs; three characteristics) which if exist in any person, that person is a hypocrite even if he/she claims to be Muslim, performs Salaat, fasts or performs Hajj and Umrah: the one who lies at the time of speaking; and when he/she promises, breaks that promise (does not fulfill the promise); and when something is trusted (given in trust) to him/her, breaches that trust [1].
[1] Nahjul Fasaha, Page 422, Hadith 1280.
source : Shafaqna
