Nowruz is the beginning day of spring which marks the beginning of the Solar Hijri calendar.

Shiite sources include hadiths on Nowruz. According to some hadiths, Nowruz is a blessed day, which is to be celebrated. For instance, Imam al-Sadiq (a) is reported to have instructed ghusl, wearing one’s best clothes, a special prayer, and fasting on Nowruz. In another tradition, Imam al-Sadiq (a) is reported to have mentioned a number of important events that had occurred on the day of Nowruz, such as the event of Ghadir.