天台菩薩戒疏 1.23

1.23

就初序為二：初、偈頌明舍那發起，次、長行明釋迦勸發。初文又四戒、三勸。四戒者，一、舍那，二、釋迦，三、菩薩，四、眾生。三勸者，一、勸受，二、勸持，三、勸誦。此之四戒得之有由，根本傳授得記成佛，所以勸受。受已須持，持已須誦，使佛種不斷。

Regarding the first, the preface, there are two parts: first, the verses explain Rocana's initiation; second, the prose explains Śākyamuni's exhortation and initiation. The first text also has four precepts and three exhortations. The four precepts are: first, Rocana; second, Śākyamuni; third, the bodhisattvas; fourth, sentient beings. The three exhortations are: first, exhorting reception; second, exhorting upholding; third, exhorting recitation. The obtaining of these four precepts has its origin: through fundamental transmission and receipt of prediction to attain buddhahood, one is exhorted to receive them. Having received them, one must uphold them; having upheld them, one must recite them, so that the Buddha-seed is not severed.