Visuddhimagga
The Visuddhimagga (Pali; English: The Path of Purification; Vietnamese: Thanh tịnh đạo; Sinhala: විශුද්ධි මාර්ගය), is the 'great treatise' on Buddhist practice and Theravāda Abhidhamma written by Buddhaghosa approximately in the 5th century in Sri Lanka. It is a manual condensing and systematizing the 5th century understanding and interpretation of the Buddhist path as maintained by the elders of the Mahavihara Monastery in Anuradhapura, Sri Lanka.