གཙོ་འཁོར་ཀུན་གྱི་གནས་གསུམ་འབྲུ་གསུམ་མཚན།།
The three centres of the Medicine Buddha and bodhisattvas are marked with the three syllables
Medicine Buddha, Sickness & Healing, Sādhanas, Compendium of Sādhanas, Tibetan Masters, Jamyang Khyentse Wangpo