Sunan an-Nasa'i 2419

سنن النسائي#2419Sahih

It was narrated that Umm Salamah said:"The Messenger of Allah used to enjoin fasting three days: The first Thursday, and Monday and Monday

Scholarly Authentication

We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:

Abu GhuddahShadh
Al-AlbaniShadh
Zubair Ali ZaiSahih

In-book reference: 22:330