Vinaya Pitaka
The teaching appeared early. References to the decline of the Dharma over time can be found in such Mahayana sutras as the Diamond Sutra and the Lotus Sutra, but also to a lesser degree in some texts in the Pāli Canon such as the "Cullavagga" of the Vinaya Pitaka. Nanyue Huisi was an early monk who taught about it; he is considered the third Patriarch of the Tiantai.