Sahih al-Bukhari 618

صحيح البخاري#618Sahih

Narrated Hafsa:When the Mu'adh-dhin pronounced the Adhan for Fajr prayer and the dawn became evident the Prophet ordered a two rak`at light prayer (Sunna) before the Iqama of the compulsory (congregational) prayer

Scholarly Authentication

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

Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.

In-book reference: 10:16

All of Sahih al-Bukhari