Musannaf Ibn Abi Shaybah

Hasan was asked about fasting on the day of Nowruz, so he declared it disliked and said: "Do you venerate it?" (Nowruz used to be the festival of the first day of the year according to the Persians. Also, according to the Gregorian calendar, they celebrated it as a day of joy on the 21st of March.)

Hasan was asked about fasting on the day of Nowruz, so he replied, "What connection do you have with the day of Nowruz? Do not pay attention to it; it is for the non-Arabs."