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."