The Form of Takbir in the Two Festivals

Question:
The questioner from Yemen asks: What is the form of takbir in the two festivals? And is it permissible to perform takbir collectively with a single voice?

Answer:
The takbir is: Allahu Akbar, Allahu Akbar, la ilaha illa Allah, Allahu Akbar, Allahu Akbar, wa lillah al-hamd. Or it is tripled: Allahu Akbar, Allahu Akbar, Allahu Akbar, la ilaha illa Allah, Allahu Akbar, Allahu Akbar, wa lillah al-hamd. Similar to this is: Allahu Akbar kabiran, wa al-hamdu lillah kathiran, wa subhan Allah bukratan wa asilan. All of this is prescribed (mashru') in 'Id al-Fitr after the setting of the sun until the completion of the khutbah, and in 'Id al-Adha from the entry of the month of Dhul-Hijjah to the end of the days of Tashriq, thirteen days, from the first of Dhul-Hijjah to the setting of the sun on the thirteenth day. All of this is a place for takbir.
However, in the days of Tashriq, on the Day of 'Arafah, and on the day of the festival, there is both absolute takbir and restricted takbir after the prayers. The absolute takbir is at all times. On the Day of 'Arafah, the Day of Sacrifice, and the three days of Tashriq, the absolute and the restricted takbir coincide. As for what is before 'Arafah, it is absolute in the night and the day. This is the Sunnah.
As for collective takbir, it is not prescribed (mashru') and is a religious innovation (bid'ah). Their speaking with a single voice is a religious innovation (bid'ah) and is not prescribed (mashru').

The presenter: May Allah reward you, Your Eminence.