Allah's Messenger (ﷺ) said, "The signs of a hypocrite are three: (1) whenever he speaks, he tells a lie, (2) whenever he is entrusted, he proves to be dishonest, (3) whenever he promises, he breaks his promise.
Sahih al-Bukhari Book 52, Hadith 43
← Previous Hadith Abu Sufyan told me that Heraclius said to him, "When I inquired you what he (i.e. Muhammad) ordered you, you replied that he ordered you to establish the prayer, to speak the truth, to be chaste, to keep promises and to pay back trusts." Then Heraclius added, "These are really the qualities of a prophet."

Sahih al-Bukhari Book 52, Hadith 42 Next Hadith → Jabir bin `Abdullah said, "When the Prophet (ﷺ) died, Abu Bakr received some property from Al-`Ala bin Al-Hadrami. Abu Bakr said to the people, "Whoever has a money claim on the Prophet, or was promised something by him, should come to us (so that we may pay him his right)." Jabir added, "I said (to Abu Bakr), Allah's Messenger (ﷺ) promised me that he would give me this much, and this much, and this much (spreading his hands three times)." Jabir added, "Abu Bakr counted for me and handed me five-hundred (gold pieces), and then five-hundred, and then five-hundred."

Sahih al-Bukhari Book 52, Hadith 44