Sahih al-Bukhari Book 34, Hadith 22
Anas went to the Prophet (ﷺ) with barley bread having some dissolved fat on it. The Prophet (ﷺ) had
mortgaged his armor to a Jew in Medina and took from him some barley for his family. Anas heard
him saying, "The household of Muhammad did not possess even a single Sa of wheat or food grains
for the evening meal, although he has nine wives to look after." (See Hadith No. 685)
The Prophet (ﷺ) purchased food grains from a Jew on credit and mortgaged his iron armor to him.
When Abu Bakr As-Siddiq was chosen Caliph, he said, "My people know that my profession was not incapable of providing substance to my family. And as I will be busy serving the Muslim nation, my family will eat from the National Treasury of Muslims, and I will practice the profession of serving the Muslims."