Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
There are two types of takbir: unrestricted and restricted. Unrestricted takbir starts from the beginning of Dhul-Hijjah until the days of Eid, while restricted takbir is confined to the time after the obligatory Prayers.
The transmitted wording of takbir is,
Allahu Akbar, Allahu Akbar, la Ilaha illa Allah; Allahu Akbar, Allahu Akbar, walillah al-hamd.
(Allah is the Greatest, Allah is the Greatest. There is no god but Allah; Allah is the Greatest, Allah is the Greatest, and all praise is due to Allah).
There is also another version transmitted from Salman (may Allah be pleased with him), who used to say, “Allahu Akbar, Allahu Akbar, Allahu Akbar Kabira” (Allah is the Greatest, Allah is the Greatest, Allah is the Ever Greatest). Then he followed this by sending blessings on the Prophet (peace and blessings be upon him). This version of takbir is applicable at any time; however, it was not transmitted from the Prophet (peace and blessings be upon him) nor from any other righteous companions (may Allah be pleased with them).
Restricted takbir, on the other hand, is restricted to the time following every obligatory prayer, especially if it is offered in congregation, as most scholars restrict it. This type of takbir also includes takbir in the place of Eid Prayer, on the way to it and while one is sitting around waiting for the Eid prayer.
On such occasions, one should not remain silent, in both Eid Al-Fitr or Eid Al-Adha, for these are days on which Islamic rites should be properly observed.
Takbir is one of the most prominent Islamic rites. It is reported that the Prophet (peace and blessings be upon him) said, “Ornament your feasts with takbir.” (At-Tabarani)
Allah Almighty knows best.
Editor’s note: This fatwa is from Ask the Scholar’s archive and was originally published at an earlier date.