I heard the Messenger of Allah ﷺ say, "The cure for sciatica is the fat tail of a Arabi sheep, melted down and divided into three portions, with one portion drunk on an empty stomach each day."
حدثنا هشام بن عمار وراشد بن سعيد الرملي قالا حدثنا الوليد بن مسلم حدثنا هشام بن حسان حدثنا أنس بن سيرين أنه سمع
سمعت رسول الله ﷺ يقول شفاء عرق النسا ألية شاة أعرابية تذاب ثم تجزأ ثلاثة أجزاء ثم يشرب على الريق في كل يوم جزء
Sahih. Takhrij: Its isnad is sahih. Hakim narrated it, 4/206, through the hadith of Walid, and said, "Sahih according to the standard of the two Shaykhs," and Dhahabi agreed with him. Busiri said, "This isnad is sahih, its narrators are trustworthy." Walid explicitly stated that he heard it directly, and Muhammad bin Abdullah Ansari corroborated him, as found in Ahmad, 3/219.