وَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : " إِنَّ مِنَ الظُّلْمِ مَطْلَ الْغَنِيِّ ، وَإِذَا أُتْبِعَ أَحَدُكُمْ عَلَى مَلِيءٍ فَلْيَتْبَعْ " .
And the Prophet Muhammad (peace and blessings be upon him) said: Delaying repayment by a wealthy person is injustice, and when any of you is referred to a wealthy person, he should pursue him.