Difference between Restricted and Unrestricted Takbir in Dhul-Hijjah
1- Unrestricted Takbir (mutlaq) is not limited to a specific time, and it is Sunnah to say it all the time, morning and evening, before prayer and after prayer, at all times. Restricted Takbir (muqayyad) is limited to the time immediately after prayer. 2- It is Sunnah to recite unrestricted takbir during the first ten days of Dhul-Hijjah and all the days of Tashriq, starting from the beginning of the month of Dhul-Hijjah (i.e., from sunset on the last day of Dhul-Qi’dah) until the end of the days of Al-Tashriq, which is when the sun sets on the thirteenth day of Dhul-Hijjah). 3-With regard to restricted takbir, it starts from Fajr on the day of ‘Arafah and lasts until the sun sets on the last day of the days of Tashriq. 4-The scholars have different views on the formulas of Takbir which are explained in the detailed answer.
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