俱舍論記 15.76

15.76

「若犯重人至授學苾芻」者，說一切有部難。若犯重人由無戒故非苾芻者，即無有授犯重苾芻盡形學戒。然律中說：禪難提苾芻雖復犯重，無覆藏心，世尊遣彼盡形學戒。既遣學戒，明知犯重不捨戒也。

"If a person who has committed a grave offense ... bestow [the status of] a bhikṣu undergoing training": The Sarvāstivāda objects. If a person who has committed a grave offense is not a bhikṣu on account of having no precepts, then there would be no bestowing upon a bhikṣu who has committed a grave offense the training in the precepts for the rest of his life. Yet it is said in the Vinaya: although the bhikṣu Chandaka had committed a grave offense, because he had no intention to conceal it, the World-Honoured One dispatched him to train in the precepts for the rest of his life. Since he was dispatched to train in the precepts, we clearly know that committing a grave offense does not abandon the precepts.