Sahih al-Bukhari 589
صحيح البخاري#589SahihNarrated Ibn `Umar:I pray as I saw my companions praying. I do not forbid praying at any time during the day or night except at sunset and sunrise
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: 9:64