(44) The Book of Financial Transactions
كتاب البيوع
(59) Chapter: To Pawn While A Resident
(59) باب الرَّهْنِ فِي الْحَضَرِ ‏‏
Sunan an-Nasa'i 4610 
It was narrated from Anas bin Malik that he brought some barley bread and rancid oil to the Messenger of Allah. He said:
"He put his armor in pledge for that with a Jew in Al-Madinah, and he took some barley from him for his family.
أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا هِشَامٌ، قَالَ حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّهُ مَشَى إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم بِخُبْزِ شَعِيرٍ وَإِهَالَةٍ سَنِخَةٍ ‏.‏ قَالَ وَلَقَدْ رَهَنَ دِرْعًا لَهُ عِنْدَ يَهُودِيٍّ بِالْمَدِينَةِ وَأَخَذَ مِنْهُ شَعِيرًا لأَهْلِهِ ‏.‏
Reference : Sunan an-Nasa'i 4610
In-book reference : Book 44, Hadith 162
English translation : Vol. 5, Book 44, Hadith 4614