A CRITICAL EDITION & ANNOTATED TRANSLATION OF AN EARLY TEXT OF BATBAYOGA The Khecarividya of Adinatha, a Sanakrit text dated to pre1400 ce, teaches khecara, one of the most important exercises of hathayoga, in which the tongue is inserted above the palate in order to drink the amrta or nectar of immortaity dripping from the top of the skull.