Sahih Bukhari

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