It is narrated from the Prophet of Islam (PBUH) who said: There are four signs in a genuine person: He/she tells the truth (does not lie); believes in good news and warnings from Allah (SWT) (believe in God’s promises); fulfills his/her promises; and avoids deceit and treachery [1].
[1] Tohaful Oqool, Page 20.
source : shafaqna.com
