Jami` at-Tirmidhi 745
جامع الترمذي#745SahihAishah narrated:"The Prophet used to try to fast on Mondays and Thursdays
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 ZaiIsnaad Sahih
In-book reference: 8:64