The wikipedia article says:
"In Thailand, Budai is sometimes confused with another similar monk widely respected in Thailand, Phra Sangkajai or Sangkachai (Thai: พระสังกัจจายน์). Phra Sangkajai, a Thai spelling of Mahakaccayanathera (Thai: มหากัจจายนเถระ), was a Buddhist Arhat (in Sanskrit) or Arahant (in Pali) during the time of the Lord Buddha"
Anyone know who "Mahakaccayanathera" was? I can't find a reference.
"When one thing is practiced & pursued, ignorance is abandoned, clear knowing arises, the conceit 'I am' is abandoned, latent tendencies are uprooted, fetters are abandoned. Which one thing? Mindfulness immersed in the body." -AN 1.230