Is it obligatory or Sunnah?
The word Qurban (udhiyah) means an animal of the ‘an’aam class (i.e., camel, cow, sheep, or goat) that is slaughtered during the days of Eid al-Adha because of the Eid and as an act of worship, intending to draw closer to Allaah.
This is one of the rituals of Islam prescribed in the Book of Allaah and the Sunnah of His Messenger (peace and blessings of Allaah be upon him), and according to the consensus of the Muslims.
In the Qur’an:
1 – Allaah says (interpretation of the meaning): “Therefore turn in prayer to your Lord and sacrifice (to Him only)” [al-Kawthar 108:2]
2 – Allaah says (interpretation of the meaning):
“Say (O Muhammad): Verily, my Salaah (prayer), my sacrifice, my living, and my dying are for Allaah, the Lord of the ‘Aalameen (mankind, jinn and all that exists). He has no partner. And of this, I have been commanded, and I am the first of the Muslims” [al-An’aam 6:162]
The word nusuk (translated here as a sacrifice) means sacrifice; this is the view of Sa’eed ibn Jubayr. And it was said that it means all acts of worship, including sacrifice, which is more comprehensive.
3 – Allaah says (interpretation of the meaning):
“And for every nation, We have appointed religious ceremonies, that they may mention the Name of Allaah over the beast of cattle that He has given them for food. And your Ilaah (God) is One Ilaah (God Allaah), so you must submit to Him Alone (in Islam). And (O Muhammad) give glad tidings to the Mukhbitoon [those who obey Allaah with humility and are humble from among the true believers of Islamic Monotheism]” [al-Hajj 22:34]