Al-Baqarah - 2:280

وَإِن كَانَ ذُو عُسْرَةٍ فَنَظِرَةٌ إِلَى مَيْسَرَةٍ وَأَن تَصَدَّقُواْ خَيْرٌ لَّكُمْ إِن كُنتُمْ تَعْلَمُونَ
[2:280]
And if (the debtor) is in straitness, then let there be postponement until (he is in) ease; and that you remit (it) as alms is better for you, if you knew.
If the debtor is in a difficulty, grant him time Till it is easy for him to repay. But if ye remit it by way of charity, that is best for you if ye only knew.
And if the debtor is in straitened circumstances, then (let there be) postponement to (the time of) ease; and that ye remit the debt as almsgiving would be better for you if ye did but know.