Sahih al-Bukhari, Hadith 5771 ⓘ
Narrated Abu Huraira: Allah's Messenger said: The cattle (sheep, cows, camels, etc.) 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).
وَعَنْ أَبِي سَلَمَةَ، سَمِعَ أَبَا هُرَيْرَةَ، بَعْدُ يَقُولُ قَالَ النَّبِيُّ صلى الله عليه وسلم " لاَ يُورِدَنَّ مُمْرِضٌ عَلَى مُصِحٍّ " . وَأَنْكَرَ أَبُو هُرَيْرَةَ حَدِيثَ الأَوَّلِ قُلْنَا أَلَمْ تُحَدِّثْ أَنَّهُ لاَ عَدْوَى فَرَطَنَ بِالْحَبَشِيَّةِ. قَالَ أَبُو سَلَمَةَ فَمَا رَأَيْتُهُ نَسِيَ حَدِيثًا غَيْرَهُ.
also referenced under: Book 76, Hadith 85 (In-Book) & Volume 7, Book 71, Hadith 665 (USC-MSA)