俱舍論頌疏論本 15.20

15.20

有說由犯重者，經部師云：「於四重禁若隨犯一，亦捨勤策及苾芻戒。」

Regarding 'some say through committing a major offense': the Sautrāntika masters say: 'If one commits any one of the four major prohibitions, one also relinquishes the vows of a novice (śrāmaṇera) and a monk (bhikṣu).'