一切經音義 50.123

50.123

經部（佛去世後四百年中從說一切有分出此部唯立一藏言唯有一經藏也所以作此名者云經是根本律及阿毗曇還解經義既不出經外故唯立一經藏也）。

Sautrāntika (Within four hundred years after the Buddha's decease, this school branched off from the Sarvāstivāda. They establish only one piṭaka, stating that there is solely a Sūtrapiṭaka. The reason for taking this name is that they hold sūtras to be the fundamental root, while vinaya and abhidharma merely explain the meaning of the sūtras; since they do not go beyond the sūtras, they establish only a Sūtrapiṭaka).