Sahih Muslim Book 10, Hadith Number 3858.

Chapter : He (the Holy Prophet) cursed the one who accepts interest and the one who pays it.

Abu Huraira (Allah be pleased with him) reported Allah’s Messenger (may peace be upon him) as saying: Let dinar be exchanged for dinar, with no addition on either side and dirham be exchanged for dirham with no addition on either side. This hadith has been narrated on the authority of Musa b. Abu Tamim with the same chain of transmitters.