Narrated Ibn 'Umar: The Prophet permitted (them).
Vol: 002 Book: 026 Hadith: 799
Narrated Al-A'mash: We argued at Ibrahim's dwelling place about mortgaging in Salam. He said, "Aisha said, 'The Prophet bought some foodstuff from a Jew on credit and the payment was to be made by a definite period,...
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Glory is to You, Master of power, of dominion, of majesty and greatness.
Info: Abu Dawud 1/230, An-Nasa'i and Ahmad. Its chain of narration is good (Hasan).