Messenger of Allah ﷺ said, "No 'Adwa." Abu Huraira also said: The Prophet ﷺ said, "The cattle suffering from a disease should not be mixed up with healthy cattle (or said "Do not put a patient with a healthy person as a precaution.") Abu Huraira also said: Messenger of Allah ﷺ said, "No 'Adwa." A bedouin got up and said, "Don't you see how camels on the sand look like deer but when a mangy camel mixes with them, they all get infected with mange?" On that the Prophet ﷺ said, "Then who conveyed the (mange) disease to the first camel?"  

إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ عَدْوَى قَالَ أَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ سَمِعْتُ أَبَا هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ قَالَ لاَ تُورِدُوا الْمُمْرِضَ عَلَى الْمُصِحِّ وَعَنِ الزُّهْرِيِّ قَالَ أَخْبَرَنِي سِنَانُ بْنُ أَبِي سِنَانٍ الدُّؤَلِيُّ أَنَّ أَبَا هُرَيْرَةَ ؓ قَالَ إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ عَدْوَى فَقَامَ أَعْرَابِيٌّ فَقَالَ أَرَأَيْتَ الإِبِلَ تَكُونُ فِي الرِّمَالِ أَمْثَالَ الظِّبَاءِ فَيَأْتِيهِ الْبَعِيرُ الأَجْرَبُ فَتَجْرَبُ قَالَ النَّبِيُّ ﷺ فَمَنْ أَعْدَى الأَوَّلَ