Bukhari

Hadith Commentary:
(1)
In one hadith, it is mentioned that when Khaybar and Fadak were conquered, whatever was obtained from there in the form of fay’ (spoils of war not acquired through battle) included a fifth (khums) share for the Messenger of Allah sallallahu alayhi wa sallam. From the date orchards that came into the share of the Prophet sallallahu alayhi wa sallam, he would set aside a year’s provision for his family, and the remaining produce he would spend in the way of Allah, the Exalted.
(Sahih al-Bukhari, Kitab al-Fard al-Khums, Hadith: 3094)
Given this situation, what then is the meaning of his poverty and subsistence on little? The answer is that even after setting aside a year’s provision for his family, he would spend it on those who asked and the needy.
A prominent aspect of the life of the Messenger of Allah sallallahu alayhi wa sallam is that he would never send a petitioner away empty-handed.

(2)
At times, the situation reached such a point that, in the last part of his noble life, he took thirty wasqs of dates on credit from a Jew and kept his iron armor as collateral with him, but he passed away before redeeming it.
(Sahih al-Bukhari, Kitab al-Rahn, Hadith: 2509)

(3)
Hafiz Ibn Hajar rahimahullah has written that this subsistence on little was not due to financial weakness, but rather because of altruism and compassion. In any case, the Prophet sallallahu alayhi wa sallam did not like to eat to his fill.
(Fath al-Bari: 11/352)
And Allah knows best.