Is there amongst us one from Qaran? That person came and Umar said: Verily Messenger of Allah ﷺ has said: There would come to you a person from Yemen who would be called Uwais and he would leave none in Yemen (behind him) except his mother, and he would have the whiteness (due to leprosy) and he supplicated Allah and it was cured except for the size of a dinar or dirham. He who amongst you meets him should ask him to supplicate for forgiveness (from Allah) for you.  

أَنَّ أَهْلَ الْكُوفَةِ وَفَدُوا إِلَى عُمَرَ وَفِيهِمْ رَجُلٌ مِمَّنْ كَانَ يَسْخَرُ بِأُوَيْسٍ فَقَالَ عُمَرُ هَلْ هَا هُنَا أَحَدٌ مِنَ الْقَرَنِيِّينَ فَجَاءَ ذَلِكَ الرَّجُلُ فَقَالَ عُمَرُ إِنَّ رَسُولَ اللَّهِ ﷺ قَدْ قَالَ إِنَّ رَجُلاً يَأْتِيكُمْ مِنَ الْيَمَنِ يُقَالُ لَهُ أُوَيْسٌ لاَ يَدَعُ بِالْيَمَنِ غَيْرَ أُمٍّ لَهُ قَدْ كَانَ بِهِ بَيَاضٌ فَدَعَا اللَّهَ فَأَذْهَبَهُ عَنْهُ إِلاَّ مَوْضِعَ الدِّينَارِ أَوِ الدِّرْهَمِ فَمَنْ لَقِيَهُ مِنْكُمْ فَلْيَسْتَغْفِرْ لَكُمْ