phyir mi ldog pa'i sa

ཕྱིར་མི་ལྡོག་པའི་ས
level of no-return; the stage of nonregression [RY]

spiritual level from which there can be no relapse/ regression [RB]

level of no-return - the stage of non-regression. mthong lam sogs 'phags pa'i sa [IW]