About Buddha Dhatu Jadi

The Buddha Dhatu Jadi is located close to Balaghata town, in Bandarban City, in Bangladesh. Dhatu are the material remains of a holy person, and in this temple the relics belong to Buddha. It is the largest Theravada Buddhist temple in Bangladesh and has the second-largest Buddha statue in the country.
Relics of buddha from the Supreme Patriarch of Thailand

Buddhist relics – The ashes of spiritual Masters

Śarīra is a generic term referring to Buddhist relics, although in common usage it usually refers to pearl or crystal-like bead-shaped objects that are purportedly found among the cremated ashes of Buddhist spiritual masters. Relics of the Buddha after cremation are termed dhātu in the Mahaparinibbana Sutta. Śarīra are held to emanate or incite 'blessings' and 'grace' within the mindstream and experience of those connected to them. Sarira are also believed to ward off evil .