The tenth night of Dhū al-Ḥijjah is a blessed night since it is one of the four nights that should be advisably spent with acts of worship. On this night, the doors of the heavens are opened. It is also highly recommended to visit the tomb of Imam al-Husayn (عليه السلام) on this night and to say the following supplication:
يَا دَائِمَ الْفَضْلِ عَلَى الْبَرِيَّةِ يَا بَاسِطَ الْيَدَيْنِ بِالْعَطِيَّةِ يَا صَاحِبَ الْمَوَاهِبِ السَّنِيَّةِ صَلِّ عَلَى مُحَمَّدٍ وَ آلِهِ خَيْرِ الْوَرَى سَجِيَّةً وَ اغْفِرْ لَنَا يَا ذَا الْعُلَى فِي هَذِهِ الْعَشِيَّةِ.
The tenth of Dhū al-Ḥijjah is the ‘Id al-Adha (The Feast of Sacrifice) Day. A number of acts has been narrated to be done on this honorable day.
It is highly recommended to bathe oneself on this day. In fact, some scholars have decided it as obligatory.
Salat al-’Id, as is described within the acts on the ‘Id al-Fitr Day, should be offered on this day. However, on the tenth of Dhū al-Ḥijjah, it is recommended to break the fasting after offering Salat al-’Id and it is recommended to eat from the meat of the sacrificed animals.
It is recommended to say Dua al-Nudbah
(The Supplication of Lamentation)
As for those who are present at Mina,it is recommended to say the following invocation 15 times immediately after the accomplishment of 15 obligatory prayers beginning with the Dhuhr Prayer on the ‘Id al-Adha Day and ending up with the Fajr Prayer on the thirteenth of Dhū al-Ḥijjah.
As for those who are at places other than Mina, it is recommended to say these statements 10 times instead of 15 immediately after 10 obligatory prayers beginning with the Dhuhr Prayer on the ‘Id al-Adha Day and ending up with the Fajr Prayer on the twelfth of Dhū al-Ḥijjah. These statements, according to the authentic narration mentioned in al-Kafi, are as follows:
اللّٰهُ اَكْبَرُ اللّٰهُ اَكْبَرُ لا اِلَهَ اِلا اللّٰهُ وَ اللّٰهُ اَكْبَرُ اللّٰهُ اَكْبَرُ وَ لِلَّهِ الْحَمْدُ اللّٰهُ اَكْبَرُ عَلَى مَا هَدَانَا اللّٰهُ اَكْبَرُ عَلَى مَا رَزَقَنَا مِنْ بَهِيمَةِ الْاَنْعَامِ وَ الْحَمْدُ لِلَّهِ عَلَى مَا اَبْلانَا .
It is recommended to repeat these statements immediately after the obligatory and supererogatory prayers as many times as possible.