The day of full moon, Purnima, in the month of Ashadh of the Hindu calendar is traditionally celebrated as Guru Purnima (IAST: Guru Pūrṇimā, sanskrit: गुरु पूर्णिमा) by Hindus. On this day, devotees offer puja (worship) to their Guru. "He divided the Veda into four, namely Rig, Yajur, Sama and Atharva. The histories and the Puranas are said to be the fifth Veda." - Brahmanda Purana 1.4.21 The spiritual Gurus are revered on this day by remembering their life and teachings.