四分律比丘含注戒本 2.377

2.377

(if, food having not been given, he takes it himself and puts it into his mouth, he incurs a pātayantikā with each swallow. For untimely food and seven-day medicine, if the time limit is exceeded, he likewise incurs a pātayantikā. If he eats lifelong medicine without cause when it was not offered, it is a duṣkṛta)