By the command of Allah Almighty, the hands and feet of Prophet Ismāʿīl عَـلَيْـهِ الـسَّـلاَم were untied before he was given glad tidings of his sacrifice being accepted. Prophet Ismāʿīl عَـلَيْـهِ الـسَّـلاَم then said: اَللہُ اَکْبَر وَلِلّٰہِ الْحَمْد.

What these three illustrious personalities recited at that time was then joined to form what we now know as the takbīr of tashrīq: اَللہُ اَکْبَرُ اَللہ ُ اَکْبَرُ  لَآ اِلٰہَ اِلَّا اللہُ وَاللہُ اَکْبَرُ  اَللہُ  اَکْبَرُ وَلِلّٰہِ الْحَمْد.^[1]

Dear Islamic brothers! We too should close our eyes when reciting takbīr al-tashrīq after every farḍ salah, remembering the sacrifice of Prophet Ibrāhīm عَـلَيْـهِ الـسَّـلاَم and Prophet IsmāꜤīl عَـلَيْـهِ الـسَّـلاَم. 

اِنْ شَــآءَالـلّٰـه   In this manner, our enjoyment in reciting the takbīr will be heightened. May Allah Almighty grant us the ability to do so.

The days of Tashrīq are days of dhikr

Dear Islamic brothers! From the 10^th of Dhū al-Ḥijja (the first day of Eid al-Aḍḥā) to the 13^th, it is forbidden by Islamic law for us to fast. The final Prophet of Allah صَلَّى الـلّٰـهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم proclaimed, “Hear well! Certainly, these days are days of eating, drinking, and dhikr of Allah.”^[2]

Commenting on this, Mufti Aḥmad Yār Khān رَحْمَةُ الـلّٰـهِ عَـلَيْه writes:

These are days of hospitality for people, in which Allah Almighty is the Host and His servants are His guests. Fasting on these days is to reject an invitation to eat from Allah Almighty. So, eat, drink, and make much dhikr of Allah Almighty during these days.^[3]