Anas bin Malik came to Muawiya bin Abu Sufyan while he was in Damascus. He entered upon him, and Muawiya said to him, "Narrate to me a hadith you heard directly from the Messenger of Allah ﷺ with no one between you and him."Anas said, "I heard the Messenger of Allah ﷺ say, 'Faith is Yemeni, extending all the way to Lakhm and Judham.'"
حدثنا علي بن عياش حدثنا محمد بن مهاجر
أقبل أنس بن مالك إلى معاوية بن أبي سفيان وهو بدمشق قال فدخل عليه فقال له معاوية حدثني بحديث سمعته من رسول الله ﷺ ليس بينك وبينه فيه أحد قال قال أنس سمعت رسول الله ﷺ يقول الإيمان يمان هكذا إلى لخم وجذام
Its isnad is sahih. Ali bin Ayyash is trustworthy and firmly reliable, Muhammad bin Muhajir Ansari Shami is trustworthy, and Urwa bin Ruwaym is truthful but tends to omit links in transmission, though he did not omit one here, so his hadith is sahih.Haythami said in 10/55, Ahmad narrated it, and its narrators are the narrators of the Sahih, except for Urwa bin Ruwaym, who is trustworthy. Something similar to it is found in the Sahih collections, apart from the mention of "Lahm" and "Judham."