Sahih al-Bukhari 2966
صحيح البخاري#2966SahihNarrated Salim Abu An-Nadr:The freed slave of `Umar bin 'Ubaidullah who was `Umar's clerk: `Abdullah bin Abi `Aufa wrote him (i.e. `Umar) a letter that contained the following:-- "Once Allah's Messenger (ﷺ) (during a holy battle), waited till the sun had declined and then he got up among the people and said, "O people! Do not wish to face the enemy (in a battle) and ask Allah to save you (from calamities) but if you should face the enemy, then be patient and let it be known to you that Paradise is under the shades of swords." He then said,, "O Allah! The Revealer of the (Holy) Book, the Mover of the clouds, and Defeater of Al-Ahzab (i.e. the clans of infidels), defeat them infidels and bestow victory upon us
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: 56:175