No doubt, the Prophet ﷺ mortgaged his armor for barley grams. Once I took barley bread with some dissolved fat on it to the Prophet ﷺ and I heard him saying, "The household of Muhammad did not possess except a Sa (of food grain, barley, etc.) for both the morning and the evening meals although they were nine houses."  

وَلَقَدْ رَهَنَ النَّبِيُّ ﷺ دِرْعَهُ بِشَعِيرٍ وَمَشَيْتُ إِلَى النَّبِيِّ ﷺ بِخُبْزِ شَعِيرٍ وَإِهَالَةٍ سَنِخَةٍ وَلَقَدْ سَمِعْتُهُ يَقُولُ مَا أَصْبَحَ لآلِ مُحَمَّدٍ ﷺ إِلاَّ صَاعٌ وَلاَ أَمْسَى وَإِنَّهُمْ لَتِسْعَةُ أَبْيَاتٍ