俱舍論疏 20.68

20.68

論「若不爾者去來性不成」，經部師云：若不如我說有曾有名有、當有名有，如有部立三世有體，去、來性不成，同有體故。

The Śāstra says: "If it were not so, the nature of past and future could not be established": the Sautrāntika master says: If one does not explain, as I do, that 'having once existed' is called 'existing' and 'bound to exist' is called 'existing', and instead establishes, as the Sarvāstivādins do, that the three times have substances, then the nature of past and future could not be established, because both would equally have substance.