What are hadiths about faithfulness? Examples of hadiths about faithfulness…
According to al-Nuʿman b. Bashir (ra), “The Prophet was given a gift of some grapes from Taʾif. He called me and said, ‘Take this bunch of grapes and give it to your mother.’ But I ate it before I gave it to her. A few nights later he said to me, ‘What happened to the bunch of grapes? Did you give it to your mother?’ I said, ‘No, So he called me disloyal.’” (Ibn Maja, al-Atʿima, 61)
According to ʿAbd Allah b. ʿUmar (ra), the Messenger of Allah (saw) said, “The finest act of goodness on the part of a son is to treat kindly the loved ones of his father.” (Muslim, al-Birr, 11)
According to Anas (ra), the Messenger of Allah (saw) said, “On the Day of Judgement, each unfaithful person will have a banner indicating his unfaithfulness.” (Muslim, al-Jihad wa ‘l-Siyar, 14)
ʿA’isha (ra) said, “I did not feel jealous of any of the wives of the Prophet (saw) as much as I did of Khadija. Although I did not see her, the Prophet (saw) used to mention her very often, and whenever he slaughtered a sheep, he would cut parts and send them to the women friends of Khadija. When I sometimes said to him, ‘(You treat Khadija in such a way) as if there is no woman on earth except Khadija,’ he would say, ‘Khadija was such-and-such, and from her I had children.’” (al-Bukhari, Manaqib al-Ansar, 20)
Source: Presidency Of Religious Affairs The Turkey, Islam Through Hadiths