He reported in <i>mursal</i> form that God’s messenger said:

“If anyone has himself cupped or smeared with something on a Saturday or a Wednesday, he must blame no one but himself if he gets leprosy.” It is transmitted in <i>Sharh as-sunna</i>.

وَعَنْهُ مُرْسَلًا قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنِ احْتَجَمَ أَوِ اطَّلَى يَوْمَ السَّبْتِ أَوِ الْأَرْبِعَاءِ فَلَا يَلُومَنَّ إِلَّا نَفْسَهُ فِي الوَضَحِ» . رَوَاهُ فِي شرح السّنة