The Messenger of Allah ﷺ said: There is for every apostle a prayer, and I intend (if Allah so willed) that I would reserve my prayer for the intercession of my Ummah on the Day of Resurrection. (Using translation from Muslim 198b)
قَالَ النَّبِيُّ ﷺ «لِكُلِّ نَبِيٍّ دَعْوَةٌ وَأُرِيدُ إِنْ شَاءَ اللَّهُ تَعَالَى أَنْ أَخْتَبِئَ دَعْوَتِي شَفَاعَةً لِأُمَّتِي يَوْمَ الْقِيَامَةِ»