The Prophet ﷺ used to say takbir between the segments of the sermon, frequently saying takbir during the sermons of the two Eids.
حدثنا هشام بن عمار حدثنا
كان النبي ﷺ يكبر بين أضعاف الخطبة يكثر التكبير في خطبة العيدين
No references are available.
Its chain is daif, and Busiri also graded it daif. See hadith no. 1101 for its defect.