維摩經玄疏 4.73

4.73

First, treatises specifically expounding Hīnayāna sūtras: for example, the Abhidharmakośa specifically expounds the sūtras, the Vinayasūtra specifically expounds the Vinaya, and the Mahāvibhāṣā and the various Abhidharmahṛdayas clearly expound the Abhidharma preached by the Buddha while he was in the world.