Mishkat al-Masabih 29 Excellent Qualities and Description of the Prophet كتاب الفضائل والشمائل 28

وَعَنْ أُبَيِّ بْنِ كَعْبٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا كَانَ يَوْمُ الْقِيَامَةِ كُنْتُ إِمَامَ النَّبِيِّينَ وَخَطِيبَهُمْ وَصَاحِبَ شَفَاعَتِهِمْ غيرَ فَخر» . رَوَاهُ التِّرْمِذِيّ

Ubayy b. Ka’b reported the Prophet as saying, “On the day of resurrection I shall be the leader ( imam ) of the prophets, their spokesman, and the one who will intercede for them, and this is no boast.” Tirmidhi transmitted it.