آيَةُ الْمُنَافِقِ ثَلَاثٌ: إِذَا حَدَّثَ كَذَبَ، وَإِذَا وَعَدَ أَخْلَفَ، وَإِذَا اؤْتُمِنَ خَانَ
Translation: Three signs of a hypocrite are: when he speaks, he lies; when he promises, he breaks the promise; and when he is entrusted with something, he betrays that trust.
Source: Bukhari.
آيَةُ means “sign” here; الْمُنَافِقِ means “of the hypocrite,” and ثَلَاثٌ means “three.” إِذَا means “when”; each occurrence names a situation and the conduct that follows it.
The narration warns against dishonesty in speech, promises, and things entrusted to a person. Recognizing wrong conduct is necessary, but claiming certain knowledge of another person’s inner faith is a different matter.