Jami` at-Tirmidhi 2051
جامع الترمذي#2051Da'ifAnas narrated:"The Prophet (S.A.W) would get cupped in his jugular veins and his upper back. And he would get cupped on the seventeenth (of the month), (or) the nineteenth, and (or) the twenty first
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiDaif
In-book reference: 28:16