عَنْ حُسَيْنٍ عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ لَا تُدِيمُوا النَّظَرَ إِلَى الْمُجَذَّمِينَ وَإِذَا كَلَّمْتُمُوهُمْ فَلْيَكُنْ بَيْنَكُمْ وَبَيْنَهُمْ قِيدَ رُمْحٍ
Sayyiduna Ali ibn Abi Talib (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: Do not look at leprosy patients for a long time, and when you speak to them, there should be a distance between you and them equal to the length of a spear.