Question 8: Why is it Sunnah to utter Takbeer (saying: “Allaahu Akbar [Allaah is the Greatest]”) twelve times before we recite Soorah Al-Faatihah in `Eed Prayer? And what is the benefit of this and why do we do it in `Eed Prayer and not in the Five Obligatory Prayers?
Answer: The basic ruling in acts of ‘Ibaadah (worship) is that they are Tawqeef (bound by a religious text and not amenable to personal opinion). We should worship Allaah in the manner He (Exalted be He) and His Messenger (peace be upon him) told us to, whether we know the wisdom behind this or not. This is especially so regarding acts of ‘Ibaadah, such as Salaah (Prayer), Sawm (Fasting), and Hajj, as the intellect has no role to play in these. It also includes what the Prophet (peace be upon him) ordained in regard to saying Takbeer six or seven times after the Takbeeraat-ul-Ihraam (saying: “Allaahu Akbar” upon starting Prayer) before reciting Soorah Al-Faatihah in the first Rak`ah (unit of Prayer) of the Two `Eed Prayers, and saying it five times before reciting Soorah Al-Faatihah in the second Rak`ah of the Two `Eed Prayers, which is different from the Five Obligatory Prayers. We have to believe in whatever Allaah (Exalted be He) and His Messenger (peace be upon him) prescribed for us, surrender to Him, and listen and obey... read more here.