SHAFAQNA – Imam Ali (AS) said: The connection between truthfulness and religion is like head to the body . So, truthfulness is placed right on top of the religion. It is also narrated from Imam Sadeq (AS) who said: When a person speaks the truth, the first being who approves that person is Allah (SWT) and that person also knows that he/she is telling the truth. If a person lies, the first being who rejects that person is the Almighty and that person also knows that he/she is a liar .
 Tasneef Qorarul Hekam wa Dorarul Kalam, Page 218.
 Thawabul Aamaal wa Eqabul Aamaal, page 178.