The Imam should not supplicate for himself only Sunan Ibn Majah 923
Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُصَفَّى الْحِمْصِيُّ، حَدَّثَنَا بَقِيَّةُ بْنُ الْوَلِيدِ، عَنْ حَبِيبِ بْنِ صَالِحٍ، عَنْ يَزِيدَ بْنِ شُرَيْحٍ، عَنْ أَبِي حَىٍّ الْمُؤَذِّنِ، عَنْ ثَوْبَانَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ يَؤُمُّ عَبْدٌ فَيَخُصَّ نَفْسَهُ بِدَعْوَةٍ دُونَهُمْ فَإِنْ فَعَلَ فَقَدْ خَانَهُمْ "
Translation
It wasnarrated that Thawban said
“The Messenger of Allah (ﷺ)said: ‘Noperson should lead others in prayer, then supplicate onlyfor himselfand not for them. If he does that, he has betrayed them.’”