Sahih Al Bukhari Hadith Number 2394

Narrated Jabir bin `Abdullah: I went to the Prophet (peace be upon him) while he was in the Mosque. (Mas`ar thinks, that Jabir went in the forenoon.) After the Prophet (peace be upon him) told me to pray two rak`at, he repaid me the debt he owed me and gave me an extra amount.

43  Loans, Payment of Loans, Freezing of Property, Bankruptcy
Hadith number 2394
Volume no 3
Chapter: 7 (Repaying debts handsomely)