"Abide by truthfulness. For indeed truthfulness leads to righteousness. And indeed righteousness leads to Paradise. A man continues telling the truth and trying hard to tell the truth until he is recorded with Allah as a truthful person. Refrain from falsehood. For indeed falsehood leads to wickedness, and wickedness leads to the Fire. A slave (of Allah) continues lying and trying hard to lie, until he is recorded with Allah as a liar."  

قَالَ رَسُولُ اللَّهِ ﷺ عَلَيْكُمْ بِالصِّدْقِ فَإِنَّ الصِّدْقَ يَهْدِي إِلَى الْبِرِّ وَإِنَّ الْبِرَّ يَهْدِي إِلَى الْجَنَّةِ وَمَا يَزَالُ الرَّجُلُ يَصْدُقُ وَيَتَحَرَّى الصِّدْقَ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ صِدِّيقًا وَإِيَّاكُمْ وَالْكَذِبَ فَإِنَّ الْكَذِبَ يَهْدِي إِلَى الْفُجُورِ وَإِنَّ الْفُجُورَ يَهْدِي إِلَى النَّارِ وَمَا يَزَالُ الْعَبْدُ يَكْذِبُ وَيَتَحَرَّى الْكَذِبَ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ كَذَّابًا وَفِي الْبَابِ عَنْ أَبِي بَكْرٍ الصِّدِّيقِ وَعُمَرَ وَعَبْدِ اللَّهِ بْنِ الشِّخِّيرِ وَابْنِ عُمَرَ  

"When the slave (of Allah) lies, the angel goes a mile away from him because of the stench of what he has done."Yahya said: "(I asked) 'Abdur-Rahim bin Harun if he approved of it,and he said 'Yes'."  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا كَذَبَ الْعَبْدُ تَبَاعَدَ عَنْهُ الْمَلَكُ مِيلاً مِنْ نَتْنِ مَا جَاءَ بِهِ قَالَ يَحْيَى فَأَقَرَّ بِهِ عَبْدُ الرَّحِيمِ بْنُ هَارُونَ فَقَالَ نَعَمْ  

"There was no behavior more hated to the Messenger of Allah than lying. A man would lie in narrating something in the presence of the Prophet, and he would not be content until he knew that he had repented."  

مَا كَانَ خُلُقٌ أَبْغَضَ إِلَى رَسُولِ اللَّهِ ﷺ مِنَ الْكَذِبِ وَلَقَدْ كَانَ الرَّجُلُ يُحَدِّثُ عِنْدَ النَّبِيِّ ﷺ بِالْكِذْبَةِ فَمَا يَزَالُ فِي نَفْسِهِ حَتَّى يَعْلَمَ أَنَّهُ قَدْ أَحْدَثَ مِنْهَا تَوْبَةً