Sahih al-Bukhari Book 34, Hadith 21
The Prophet (ﷺ) purchased food grains from a Jew on credit and mortgaged his iron armor to him.
I heard Allah's Messenger (ﷺ) saying, "whoever desires an expansion in his sustenance and age, should keep good relations with his Kith and kin."
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)