Kurbani

Qurbānī (Arabic: قربانى‎‎), or uḍḥiyyah (Arabic: أضحية‎‎) as referred to in Islamic law, is the sacrifice of a livestock animal during Eid al-Adha. The word is related to the Hebrew qorbān "offering" and Syriac qurbānā "sacrifice", etymologised through the cognate Arabic triliteral as "a way or means of approaching someone" or "nearness". In Islamic law, udhiyyah would refer to the sacrifice of a specific animal, offered by a specific person, on specific days to seek God's pleasure and reward. The word qurban appears thrice in the Quran: once in reference to animal sacrifice and twice referring to sacrifice in the general sense of any act which may bring one closer to God. In contrast, dhabīḥah refers to normal Islamic slaughter outside the days of udhiyyah.

Islam traces the history of sacrifice back to Abel and Cain (Habil and Qabil), whose story is mentioned in the Qur'an.Abel was the first human being to sacrifice an animal for God. Ibn Kathir narrates that Abel had offered a sheep whilst his brother Cain offered part of the crops of his land. The ordained procedure of God was that a fire would descend from the heavens and consume the accepted sacrifice. Accordingly, a fire came down and enveloped the animal slaughtered by Abel thus accepting the sacrifice of Abel while Cain's sacrifice was rejected. This led to jealousy on the part of Cain resulting in the first human death when he murdered his brother Abel. After much repentance and remorse, Cain was forgiven by God.

...
Wikipedia