مَن أقرَضَ مُؤمناً قَرضاً يَنتَظِرُ بهِ مَيسورَهُ كانَ مالُهُ في زَكاةٍ ، وكانَ هو في صَلاةٍ مِن المَلائكةِ حتّى‏ يُؤَدِّيَهُ إلَيهِ.

Whoever gives a loan to a believer and waits until he is able, his money will be regarded as alms-tax, and the angels will pray for him until his loan is returned.

Thawab al-A'malp, p. 167, no. 4