俱舍論記 6.200

6.200

「若有可護至是名為失」者，經部調言：此無為體若有可護，天神自護。然許實有朋虛妄計，同諸外道，是名為失。

On "If there were something to protect [up to] this is called a fault": the Sautrāntika retorts in jest: If this unconditioned entity had anything to protect, the heavenly devas would protect it themselves. However, to admit real existence would align with false conceptualizations and be identical with the non-Buddhists (tīrthikas); this is called a fault.