Zuhri reported in <i>mursal</i> form that the Prophet (ﷺ) said:

“If anyone has himself cupped on a Wednesday or a Saturday and is smitten by leprosy, he must blame no one but himself .” Ahmad and Abu Dawud transmitted it. It has been given an <i>isnad</i>, but Abu Dawud said that that is not sound;

وَعَنِ الزُّهْرِيِّ مُرْسَلًا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مِنْ احْتَجَمَ يَوْمَ الْأَرْبِعَاءِ أَوْ يَوْمَ السَّبْتِ فَأَصَابَهُ وَضَحٌ فَلَا يَلُومَنَّ إِلَّا نَفْسَهُ» . رَوَاهُ أَحْمَدُ وَأَبُو دَاوُدَ وَقَالَ: وَقَدْ أسْند وَلَا يَصح