(9) باب دُعَاءُ النَّبِيِّ صلى الله عليه وسلم أَصْلِحِ الأَنْصَارَ وَالْمُهَاجِرَةَ
Narrated Anas bin Malik:
On the day of the battle of the Trench (i.e. Ghazwat-ul-Khandaq) the Ansar used to say, "We are those who have given the pledge of allegiance to Muhammad for Jihad (i.e. holy fighting) as long as we live." The Prophet (ﷺ) , replied to them, "O Allah! There is no life except the life of the Hereafter; so please honor the Ansar and the Emigrants."
Reference: Sahih al-Bukhari 3796
In-book reference: Book 63, Hadith 22
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 58, Hadith 140