Sayyiduna Ali (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Zakah has abrogated all the charities mentioned in the Qur'an, the ritual bath (ghusl) for major impurity has abrogated every (other) kind of bath, the fasting of Ramadan has abrogated every (other) kind of fast, and the sacrifice (of Eid al-Adha) has abrogated every (other) kind of slaughter."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19020