Jami` at-Tirmidhi 742
جامع الترمذي#742HasanAbdullah narrated:"The Messenger of Allah would fasting during the beginning of every month for three days, and Friday was the least of the days that he did not fast
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan
Al-AlbaniHasan
Bashar Awad MaaroufHasan
Zubair Ali ZaiIsnaad Hasan
In-book reference: 8:61