(69) بَابُ قَوْلِ اللَّهِ تَعَالَى: {يَا أَيُّهَا الَّذِينَ آمَنُوا اتَّقُوا اللَّهَ وَكُونُوا مَعَ الصَّادِقِينَ} وَمَا يُنْهَى عَنِ الْكَذِبِ
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "The signs of a hypocrite are three: Whenever he speaks, he tells a lie; and whenever he promises, he breaks his promise; and whenever he is entrusted, he betrays (proves to be dishonest)".
Reference: Sahih al-Bukhari 6095
In-book reference: Book 78, Hadith 122
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 117