The Prophet ﷺ said, "Truthfulness leads to righteousness, and righteousness leads to Paradise. And a man keeps on telling the truth until he becomes a truthful person. Falsehood leads to Al-Fajur (i.e. wickedness, evil-doing), and Al-Fajur (wickedness) leads to the (Hell) Fire, and a man may keep on telling lies till he is written before Allah, a liar."  

عَنِ النَّبِيِّ ﷺ قَالَ: «إِنَّ الصِّدْقَ يَهْدِي إِلَى الْبِرِّ وَإِنَّ الْبِرَّ يَهْدِي إِلَى الْجَنَّةِ، وَإِنَّ الرَّجُلَ لَيَصْدُقُ حَتَّى يَكُونَ صِدِّيقًا۔ وَإِنَّ الْكَذِبَ يَهْدِي إِلَى الْفُجُورِ وَإِنَّ الْفُجُورَ يَهْدِي إِلَى النَّارِ، وَإِنَّ الرَّجُلَ لَيَكْذِبُ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ كَذَّابًا۔»  

It is obligatory for you to tell the truth, for truth leads to virtue and virtue leads to Paradise, and the man who continues to speak the truth and endeavours to tell the truth is eventually recorded as truthful with Allah, and beware of telling of a lie for telling of a lie leads to obscenity and obscenity leads to Hell-Fire, and the person who keeps telling lies and endeavours to tell a lie is recorded as a liar with Allah.  

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 الرَّجُلُ يَكْذِبُ وَيَتَحَرَّى الْكَذِبَ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ كَذَّابًا  

Avoid falsehood, for falsehood leads to wickedness, and wickedness to hell; and if a man continues to speak falsehood and makes falsehood his object, he will be recorded in Allah’s presence as a great liar. And adhere to truth, for truth leads to good deeds, and good deeds lead to paradise. If a man continues to speak the truth and makes truth his object, he will be recorded in Allah’s presence as eminently truthful.  

قَالَ رَسُولُ اللَّهِ ﷺ إِيَّاكُمْ وَالْكَذِبَ فَإِنَّ الْكَذِبَ يَهْدِي إِلَى الْفُجُورِ وَإِنَّ الْفُجُورَ يَهْدِي إِلَى النَّارِ وَإِنَّ الرَّجُلَ لَيَكْذِبُ وَيَتَحَرَّى الْكَذِبَ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ كَذَّابًا وَعَلَيْكُمْ بِالصِّدْقِ فَإِنَّ الصِّدْقَ يَهْدِي إِلَى الْبِرِّ وَإِنَّ الْبِرَّ يَهْدِي إِلَى الْجَنَّةِ وَإِنَّ الرَّجُلَ لَيَصْدُقُ وَيَتَحَرَّى الصِّدْقَ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ صِدِّيقًا  

Malik related to me that he heard that Abdullah ibn Masud used to say, "You must tell the truth. Truthfulness leads to right action. Right action leads to the Garden. Beware of lying. Lying leads to corruption, and corruption leads to the Fire. Don't you see that it is said, 'He speaks the truth and acts rightly,' and, 'He lies and is corrupt.' "  

أَنَّ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ كَانَ يَقُولُ عَلَيْكُمْ بِالصِّدْقِ فَإِنَّ الصِّدْقَ يَهْدِي إِلَى الْبِرِّ وَالْبِرَّ يَهْدِي إِلَى الْجَنَّةِ وَإِيَّاكُمْ وَالْكَذِبَ فَإِنَّ الْكَذِبَ يَهْدِي إِلَى الْفُجُورِ وَالْفُجُورَ يَهْدِي إِلَى النَّارِ أَلاَ تَرَى أَنَّهُ يُقَالُ صَدَقَ وَبَرَّ وَكَذَبَ وَفَجَرَ  

Avoid falsehood, for falsehood leads to wickedness, and wickedness to hell; and if a man continues to speak falsehood and makes falsehood his object, he will be recorded in Allah’s presence as a great liar. And adhere to truth, for truth leads to good deeds, and good deeds lead to paradise. If a man continues to speak the truth and makes truth his object, he will be recorded in Allah’s presence as eminently truthful. (Using translation from Abū Dāʾūd 4989)  

قَالَ رَسُولُ اللهِ ﷺ عَلَيْكُمْ بِالصِّدْقِ فَإِنَّ الصِّدْقَ يَهْدِي إِلَى الْبِرِّ وَإِنَّ الْبِرَّ يَهْدِي إِلَى الْجَنَّةِ وَمَا يَزَالُ الرَّجُلُ يَصْدُقُ حَتَّى يُكْتَبَ عِنْدَ اللهِ ﷻ صِدِّيقًا وَإِيَّاكُمْ وَالْكَذِبَ فَإِنَّ الْكَذِبَ يَهْدِي إِلَى الْفُجُورِ وَإِنَّ الْفُجُورَ يَهْدِي إِلَى النَّارِ وَمَا يَزَالُ الرَّجُلُ يَكْذِبُ وَيَتَحَرَّى الْكَذِبَ حَتَّى يُكْتَبَ عِنْدَاللهِ كَذَّابًا  

Avoid falsehood, for falsehood leads to wickedness, and wickedness to hell; and if a man continues to speak falsehood and makes falsehood his object, he will be recorded in Allah’s presence as a great liar. And adhere to truth, for truth leads to good deeds, and good deeds lead to paradise. If a man continues to speak the truth and makes truth his object, he will be recorded in Allah’s presence as eminently truthful. (Using translation from Abū Dāʾūd 4989)  

قَالَ رَسُولُ اللَّهِ ﷺ «عَلَيْكُمْ بِالصِّدْقِ فَإِنَّ الصِّدْقَ يَهْدِي إِلَى الْبِرِّ وَإِنَّ الْبِرَّ يَهْدِي إِلَى الْجَنَّةِ وَإِنَّ الرَّجُلَ لَيَصْدُقُ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ صِدِّيقًا وَإِنَّ الْكَذِبَ يَهْدِي إِلَى الْفُجُورِ وَإِنَّ الْفُجُورَ يَهْدِي إِلَى النَّارِ وَإِنَّ الرَّجُلَ لَيَكْذِبُ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ كَذَّابًا»  

the Messenger of Allah ﷺ said, "You must be truthful, for it leads to righteousness and they are both in Paradise. And beware of dishonesty, for it leads to wickedness and they are both in the Hellfire."  

قَالَ رَسُولُ اللهِ ﷺ «عَلَيْكُمْ بِالصِّدْقِ فَإِنَّهُ يَهْدِي إِلَى الْبِرِّ وَهُمَا فِي الْجَنَّةِ وَإِيَّاكُمْ وَالْكَذِبَ فَإِنَّهُ يَهْدِي إِلَى الْفُجُورِ وَهُمَا فِي النَّارِ»  

"إِيَّاكُمْ والكَذِبَ فَإِنَّ الكَذِبَ يَهْدى إِلَى الفُجُورِ، وَإنَّ الفُجُورَ يَهْدِى إِلَى النَّارِ، وَإنَّ الرَّجلَ ليكْذِبُ وَيَتَحرَّى الكذبَ حَتَّى يُكْتَبَ عِنْدَ اللَّه كَذَّابًا، وَعَلَيكُمْ بالصِّدْقِ، فَإنَّ الصِّدْقَ يَهْدِى إِلَى البِرِ، وَإنَّ البِرَّ يَهْدِى إِلَى الجَنَّةِ، وإنَّ الرَّجُلَ لَيَصْدُقُ وَيتَحرَّى الصِّدْقَ حَتَّى يُكْتَبَ عِنْدَ اللَّهِ صِدِّيقًا ".  

"عَلَيكُمْ بِالصّدقِ فإِنَّ الصِّدقَ يَهْدِى إِلَى البِرِّ، وَإِنَّ البِرَّ يَهْدِى إِلى الجَنَّةِ، وَمَا يزَال الرَّجُلُ يَصْدُقُ، ويتحرَّى الصِّدق حَتَّى يُكْتَبَ عِنْدَ الله صِدِّيقًا، وإِيَّاكُم والكَذِب، فإِنَّ الكَذِبَ يَهْدِي إِلى الْفُجُورِ، وإِنَّ الفُجُورِ يَهْدِى إِلَى النَّارِ، ومَا يزَالُ الرَّجلُ يَكْذِبُ وَيَتَحرَّى الكَذِبَ حَتَّى يُكْتَبَ عِنْدَ اللهِ كَذَّابًا".