It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) passed near the place called Usfan, and there was a leper (a person with leprosy) there. He (peace and blessings be upon him) (on seeing him) quickened his pace and said: "If anything among diseases can be contagious (passing from one to another), it is this (leprosy)."
Imam al-Harith bin Abi Usamah recorded it in his Musnad. In its chain is a narrator named al-Khalil bin Zakariyya, who is da'if (weak); however, other authentic hadith about keeping away from leprosy and taking precautions exist in the books of the Sahih collections.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الطب / 2489
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده صحيح. » «انفرد به المصنف من هذا الطريق»