Collateral

"Narrated `Aisha:\n\nAllah's Messenger (ﷺ) bought some foodstuff (barley) from a Jew on credit and mortgaged his iron armor to him (the armor stands for a guarantor).\n\nNarrated Al-A`mash:\n\nWe argued at Ibrahim's dwelling place about mortgaging in Salam. He said, \"Aisha said, 'The Prophet (ﷺ) bought some foodstuff from a Jew on credit and the payment was to be made by a definite period, and he mortgaged his iron armor to him.\""