On the day (of the battle) of the Trench, the Ansar were saying, "We are those who have sworn allegiance to Muhammad for Jihaid (for ever) as long as we live." The Prophet ﷺ replied to them, "O Allah! There is no life except the life of the Hereafter. So honor the Ansar and emigrants with Your Generosity." (Using translation from Bukhārī 2961)
كَانَتِ الْأَنْصَارُ تَقُولُ يَوْمَ الْخَنْدَقِ [البحر الرجز] نَحْنُ الَّذِينَ بَايَعُوا مُحَمَّدَا عَلَى الْجِهَادِ مَا حَيِينَا أَبَدَا فَأَجَابَهُمُ النَّبِيُّ ﷺ «اللهُمَّ لَا عَيْشَ إِلَّا عَيْشُ الْآخِرَةِ فَاغْفِرْ لِلْأَنْصَارِ وَالْمُهَاجِرَةِ»