Allah's Messenger (ﷺ) said, 'There is no 'Adha (no disease is conveyed from the sick to the healthy without Allah's permission), nor Safar, nor Hama." A bedouin stood up and said, "Then what about my camels? They are like deer on the sand, but when a mangy camel comes and mixes with them, they all get infected with mangy." The Prophet (ﷺ) said, "Then who conveyed the (mange) disease to the first one?"
Reference: Sahih al-Bukhari 5717 In-book : Book 76, Hadith 34 USC-MSA web (English) : Vol. 7, Book 71, Hadith 615 (deprecated)
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