بسم الله الرحمن الرحيم
Hazrat Abu Qatadah Radiallahu Anhu narrated that
Rasulullah Sallallahu Alaihi Wasallam said:
“Fast on the Day of Arafah (9th of Zulhijjah), for indeed I anticipate that Allah will forgive (one’s minor sins) of the year after it, and the year before it.”
Takbeer Tashreeq is the recitation of Allahu akbar, La ilaha illa hu Wallahu akbar, Allahu akbar wa lillahil hamd after every fardh salaah commencing from the Fajr of the 9th of Dhul Hijah until after Asr of the 13th of Dhul Hijjah. (Shami vol. 1 pg. 406)
It is Wajib (incumbent) for every adult Muslim male and female to recite the Takbeeraat of Tashreeq after every Fardh Salaat-performed with Jamaat or individually from the Fajr of the 9th of Zul-Hijjah to the Asr of the 13th of Zul Hijjah. (Multaqal Abhur, Majma’ul Anhur & ad-Durrul Muntaqa, Vol: 1, Pg: 259-260, D.K.I)
Story behind Takbeer Tashreeq
When Ibrahim عليه السلام began moving the knife on his beloved son, Ismaeel عليه السلام,
the angels sent by Allah Ta’ala with a ram exclaimed. : Allahu akbar, Allahu akbar (Allah is the greatest, Allah is the greatest).
Ibrahim عليه السلام heard the voice of the angels and replied, La illah illa Allahu Wallahu akbar (There is no god besides Allah, and Allah is the greatest).
His son Ismaeel عليه السلام heard this conversation and understood that Allah had relieved him from this great rial, thus he replied, Allahu Akbar Walillahil hamd (Allah is the greatest, and to Allah belongs all praise)(Ibid).
And Allah Knows Best