[Machine] The Messenger of Allah ﷺ said, "There is no contagion (in disease)." Then, an Arab man said, "O Messenger of Allah, we take a sick sheep and put it with healthy sheep, and then the healthy sheep also become sick." The Prophet ﷺ said, "O Arab man, who caused the first (sheep) to become sick?"
قَالَ رَسُولُ اللهِ ﷺ «لَا عَدْوَى» فَقَالَ أَعْرَابِيٌّ يَا رَسُولَ اللهِ فَإِنَّا نَأْخُذُ الشَّاةَ الْجَرِبَةَ فَنَطْرَحُهَا فِي الْغَنَمِ فَتَجْرَبُ فَقَالَ النَّبِيُّ ﷺ «يَا أَعْرَابِيُّ منْ أَجْرَبَ الْأَوَّلَ»