رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1611
The Book of the Prohibited actions
Prohibition of Procrastinating by a Rich Person to Fulfill his Obligation
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ قَالَ: "مَطْلُ الْغَنِيِّ ظُلْمٌ وَإِذَا أُتْبِعَ أَحَدُكُمْ عَلَى مَلِيءٍ فَلْيَتْبَعْ" ((مُتَّفَقٌ عَلَيْهِ. معنى "أتبع": أحيل)).
Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "It is an act of oppression on the part of a person to procrastinate in fulfilling his obligation; if the repayment of a debt due to any of you is undertaken by a rich person, you should agree to the substitution." [Al-Bukhari and Muslim].
Riyad as-Salihin, 1611