瑜伽論記 6.449

6.449

成無墮法者，無墮惡趣法也，此等若成實云：總有十四生，不許中有故，大乘及薩婆多令有二十八生，必受中有故。

As for 'becoming one of the nature of non-falling': it means one of the nature not to fall into the miserable destinies. For these, according to the *Satyasiddhi*, there are fourteen rebirths in total, because intermediate existence (antarābhava) is not accepted; the Mahāyāna and the Sarvāstivāda make it twenty-eight births, because one must definitely undergo intermediate existence.