Jami` at-Tirmidhi 63
جامع الترمذي#63SahihAbu Hajib narrated from a man from Banu Ghifar who said:"The Prophet prohibited using the leftover (water) of a woman's Purification
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 ZaiHasan
In-book reference: 1:63