question #1 Sahih al-Bukhari 2252, Book 35, Hadith 13 : What does this narration teach about the permissibility of engaging in credit transactions in Islam?

We 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.”