Hadithcore
Sahih Muslim, 59 a
sahih

It is reported on the authority of Abu Huraira that the Messenger of Allah (ﷺ) said:

Three are the signs of a hypocrite: when he spoke he told a lie, when he made a promise he acted treacherously against it, when he was trusted he betrayed.

حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ، وَقُتَيْبَةُ بْنُ سَعِيدٍ، - وَاللَّفْظُ لِيَحْيَى - قَالاَ حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ، قَالَ أَخْبَرَنِي أَبُو سُهَيْلٍ، نَافِعُ بْنُ مَالِكِ بْنِ أَبِي عَامِرٍ عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏

‏ آيَةُ الْمُنَافِقِ ثَلاَثٌ إِذَا حَدَّثَ كَذَبَ وَإِذَا وَعَدَ أَخْلَفَ وَإِذَا ائْتُمِنَ خَانَ ‏

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References2 variants
In-Book Reference
Book 1, Hadith 117
USC-MSA web (English) reference
Book 1, Hadith 112 (deprecated numbering scheme)
Sharh · explanationclick to expand
Hypocrisy has two types: (1) Doctrinal: It expels the person from Islam, for he shows Islam and conceals disbelief and (2) Practical: It does not expel the person from Islam, for he just imitates the hypocrites in their morals, which is a major sin. This hadith identifies some attributes of hypocrites by clarifying the second type of hypocrisy. This hadith is part of another hadith in which the Prophet ﷺ informed that a hypocrite has three signs: (1) He used to tell lies and fabricate unrealistic stories. Lying is to say something contrary to reality. Its greatest form is to lie to Allah, the Almighty, and His Messenger ﷺ. It also includes lying in one's acts, so the hypocrite is a liar, for he shows faith but conceals disbelief inwardly. The Prophet ﷺ indicated that lying sometimes is permissible for some overriding interests. Bukhari and Muslim narrated that the Prophet ﷺ said, “He is not a liar who reconciles between people, so he conveys or says goodness.” Islam urges us to reconcile between people even if it is achieved by lying to settle quarrels and avoid feelings of hatred and enmity, (2) He used to break his promises willingly, and (3) He used to betray people's trust. He loses, betrays, and uses their trust. The Prophet ﷺ informed that whoever used to act upon these three attributes is a hypocrite even if he performs the practical acts of worship such as prayer, fasting, etc. This hadith clarifies that these qualities belong to hypocrites so whoever behaves like that resembles hypocrites. It does not mean he is a hypocrite who shows Islam and conceals disbelief, for the Prophet ﷺ did not mean that he is a hypocrite who will be eternally in the lowest degree of Hell..
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