Sahih Muslim Book 10, Hadith Number 3775.

Chapter : It is forbidden for a solvent to make delay in the payment of debt and the desirability of a reference, and it is excellent for the rich man to accept that when reference is made to him.

Anas (Allah be pleased with him) reported Allah’s Apostle (may peace be upon him) as saying: If Allah does not fructify them, then what is permissible for one of you to take the wealth of his brother?