Starting from the fajr of 9th till asr of 13th Zil-Hajj, it is essential (wajib) to recite at least once after each fardh salah. Audibly for the male.

These days are special. The Islamic day/date begins at the sunset (maghrib) of the preceding day. However, this is not the case in these dates. In these days it begins at fajr (astronomical twilight) of that day.

May Allah facilitate and accept the Hajj and udhiya (qurbani) of all Muslims. Amin!