وَعَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَطْلُ الْغَنِيِّ ظُلْمٌ فَإِذَا أُتْبِعَ أحدكُم على مَلِيء فَليتبعْ»
He reported God's Messenger as saying, “Delay in payment by a rich man is injustice, but when one of you is referred for payment to a wealthy* man he should accept the reference." (Bukhari and Muslim.) *Mali'. This word is used of a wealthy man, and also of one who cannot be called wealthy but who is careful to pay his debts.
Reported by Al-Bukhari (No. 2287, 2288, 2400), Muslim (No. 1564a, 1564b), Abu Dawud (No. 3345), At-Tirmidhi (No. 1308), An-Nasa’i (No. 4688, 4691), Ibn Majah (No. 2403), Malik (No. 1372), Ahmad (No. 7034, 7141, 7226, 7828, 8541, 9599, 9621) and Ad-Darimi (No. 2473). Cited in Mishkat al-Masabih (No. 2907).