Sahih Muslim #2050 · The Book of Marriage

Sahih MuslimAta' reported that Ibn 'Abbas sent
Sahih Muslim · Book 16 · The Book of Marriage
Sahih Muslim · كتاب 16 · كتاب النكاح
As there is no Adhan on 'Id-ul-Fitr, so you should not pronounce it. Ibn Zubair did not pronounce Adhan on that day. He (Ibn 'Abbas) also sent him (with this message) that sermon (is to be delivered) after the prayer, and thus it was done. So lbn Zubair observed prayer before Khutba.
وَحَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي عَطَاءٌ، أَنَّ ابْنَ عَبَّاسٍ، أَرْسَلَ إِلَى ابْنِ الزُّبَيْرِ أَوَّلَ مَا بُويِعَ لَهُ أَنَّهُ لَمْ يَكُنْ يُؤَذَّنُ لِلصَّلاَةِ يَوْمَ الْفِطْرِ فَلاَ تُؤَذِّنْ لَهَا - قَالَ - فَلَمْ يُؤَذِّنْ لَهَا ابْنُ الزُّبَيْرِ يَوْمَهُ وَأَرْسَلَ إِلَيْهِ مَعَ ذَلِكَ إِنَّمَا الْخُطْبَةُ بَعْدَ الصَّلاَةِ وَإِنَّ ذَلِكَ قَدْ كَانَ يُفْعَلُ - قَالَ - فَصَلَّى ابْنُ الزُّبَيْرِ قَبْلَ الْخُطْبَةِ ‏.‏
Reference : Sahih Muslim 2050In-book reference : Book 8, Hadith 6