عَنِ ابْنِ عَبَّاسٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بَعَثَ مُعَاذًا إِلَى الْيَمَنِ فَقَالَ: «إِنَّك تَأتي قوما من أهل الْكتاب. فَادْعُهُمْ إِلَى شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ. فَإِنْ هُمْ أطاعوا لذَلِك. فَأَعْلِمْهُمْ أَنَّ اللَّهَ قَدْ فَرَضَ عَلَيْهِمْ خَمْسَ صَلَوَاتٍ فِي الْيَوْمِ وَاللَّيْلَةِ. فَإِنْ هم أطاعوا لذَلِك فأعلمهم أَن الله قد فرض عَلَيْهِم صَدَقَة تُؤْخَذ من أغنيائهم فَترد فِي فُقَرَائِهِمْ. فَإِنْ هُمْ أَطَاعُوا لِذَلِكَ. فَإِيَّاكَ وَكَرَائِمَ أَمْوَالِهِمْ وَاتَّقِ دَعْوَةَ الْمَظْلُومِ فَإِنَّهُ لَيْسَ بَيْنَهَا وَبَين الله حجاب»

Abu Dharr reported the Prophet as saying, “If any man has camels, cattle, or sheep on which he does not pay what is due, they will be produced as large and fat as can be on the day of resurrection and will trample him with their hoofs and gore him with their horns. As often as the last of them pass him the first of them will be brought back to him until judgment is pronounced among mankind.” (Bukhari and Muslim.)