The Messenger of Allah ﷺ said: There was for every apostle a prayer with which he prayed for his Ummah and it was granted to him; but I wish, if Allah so wills, to defer my prayer for the intercession of my Ummah on the Day of Resurrection. (Using translation from Muslim 199c)
أَنَّ نَبِيَّ اللهِ ﷺ قَالَ لِكُلِّ نَبِيٍّ دَعْوَةٌ دَعَا بِهَا فِي أُمَّتِهِ فَتُسْتَجَابُ لَهُ وَإِنِّي أُرِيدُ إِنْ شَاءَ اللهُ أَنْ أُؤَخِّرَ دَعْوَتِي شَفَاعَةً لِأُمَّتِي يَوْمَ الْقِيَامَةِ