Anas reports that when Salmān [Al-Fārsī] – Allāh be pleased with him – was ill, Sa’d visited him and found him crying, so he asked him:
O my brother, what makes you cry? Did you not accompany the Messenger of Allāh ﷺ ? Did you not do such-and-such [good deeds]? He replied, “I am not crying over any one of two things: I am not crying out of love and yearning for this world nor out of dislike for the hereafter, but I am crying because Allāh’s Messenger ﷺ took a covenant from me about something I think I have only transgressed. He made me promise that it is enough for anyone only to have enough [of this world] as would suffice as the provisions of a traveler, but I think I have only gone too far. As for you o Sa’d, fear Allāh when you judge, and when you distribute anything and when you think about doing anything.”
Thābit (one of the reporters) said, “And it reached me that [when he died] he left only about twenty dirham of spending he had.”
Ibn Mājah, Al-Sunan. Shaykh Al-Albānī graded this narration ṣaḥīḥ. See ṣaḥīḥ wa Ḍaʿīf Sunan Ibn Mājah no. 4104.