(69) بَابُ قَوْلِ اللَّهِ تَعَالَى: {يَا أَيُّهَا الَّذِينَ آمَنُوا اتَّقُوا اللَّهَ وَكُونُوا مَعَ الصَّادِقِينَ} وَمَا يُنْهَى عَنِ الْكَذِبِ
Narrated `Abdullah:
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."
Reference: Sahih al-Bukhari 6094
In-book reference: Book 78, Hadith 121
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 116