In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Imaam Ibnul Qayyim [rahimahullaah] said:
Allaah [The Most High] punishes the liar by preventing and holding him back from the things that brings about wellbeing and benefit for him; and Allaah rewards the truthful person by granting him the ability to obtain the affairs of wellbeing in his worldly life and afterlife. There is nothing similar to truthfulness by way of which the affairs of well- being of this world and the afterlife are obtained. And there is nothing similar to lies by way of which both of them (i.e. the affairs of wellbeing in this life and the next) are corrupted.
Allaah (The Most High) said:
[يا أيها الذين آمنوا اتقوا الله وكونوا مع الصادقين –O you who believe! Fear Allaah and be with those who are truthful]