Treating sciatica

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The cure for 'irq al-nasa (sciatica) lies in the fat tail of an Arab sheep, which is melted, then divided into three parts, and one part is drunk daily for three days."
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) prescribed, for the treatment of 'irq al-nasa (sciatica), the fat tail of an Arab sheep, neither very small nor very large; it is melted, its fat divided into three parts, and then one part is drunk each day on an empty stomach. Anas (bin Sirin, the narrator) said: I have described this remedy to three hundred people, and Allah Almighty granted healing to all of them.

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) mentioned 'irq al-nasa (sciatica) and said: "The fat tail of an Arab ram is to be taken, neither very small nor very large; it is melted and (divided into three parts and) drunk for three days." Anas bin Sirin said: I have described this remedy to more than three hundred people, and all of them recovered.
All these chains are sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim). Hammad bin Salamah made its chain mu'dal (with consecutive narrators missing), but in our view the narration of al-Mu'tamir bin Sulayman and al-Walid bin Muslim is the correct and preserved one.