It is narrated from Hazrat Anas (may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) arrived in Madinah, he found that there were two days in which the people used to celebrate festivals since the days of ignorance. The Prophet (peace and blessings be upon him) said: Allah has given you better days than these in exchange—Eid al-Fitr and Eid al-Adha.