All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad (saw) is His slave and messenger.It was authentically reported that Anas ibn Maalik narrated that when the Prophet (saw) came to Al-Madeenah, the people had two days on which they engaged in amusement. He asked: “What are these two days (what is their significance)?” They said: “We celebrated them in the pre-Islamic era.” The Messenger of Allaah (saw) said: “Verily, Allaah has given you something better in place of them: the Day of Al-Adh-ha and the Day of Al-Fitr.” [Ahmad]We have highlighted in Fatwa 90304 that there is no authentic Hadeeth stating that those two feasts were the Day of Nayrooz and the day of Mihrajaan.Allaah Knows best.
(Source: islam_web) Classified in Noble Hadeeth > Sciences of Hadith