Magha Puja is celebrated on the full moon day of the third lunar month in March. According to legends after Gautama Buddha`s retreat in the Deer Park, Sarnath Buddha headed towards the Rajagaha City. Around 1250 arahants along with Sariputta and Moggalana reached Veruvana Monastery to pay their respect to Buddha. The Enlightened One delivered a sermon to this congregation. He recited the Patimokkha. The Magha Puja is thus celebrated to commemorate this event.

This day is also known as the Magha Day, Four Fold Sangha or the Sangha Day. The Sangha had four special features. Firstly all the 1250 Buddhist followers were arahants. Secondly, it was Buddha who had ordained all of them. Thirdly all of them had gathered on their own accord. Buddha did not invite them. Lastly all of them had gathered on a full moon day in the Magha (March) month. Hence the Magha Day Puja is also referred to as Four Fold Sangha.

Magha Puja is an important Festival of Buddhists. This festival honors the Sangha as well as the Buddhist community. The Sangha is an important part of Buddhism as it embodies the rules and regulations of Buddhist life and also the much-revered principle of Dhamma. Magha Puja is celebrated in Thailand with lot of fervor.