(112) بَابُ كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا لَمْ يُقَاتِلْ أَوَّلَ النَّهَارِ أَخَّرَ الْقِتَالَ حَتَّى تَزُولَ الشَّمْسُ
Narrated 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."
Reference: Sahih al-Bukhari 2965, 2966
In-book reference: Book 56, Hadith 175
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 210