四分律刪繁補闕行事鈔 3.178

3.178

五說淨者。七日一藥，作口法竟，偏心屬己，須說淨畜：一藥體貴重，貪積心多；二久延多時，無變動義；三氣味殊越，資身力強。制令說淨，捨封著也！手受七日，時少過希，亦不須說。餘之三藥，反前不具，故不須淨。淨法大同衣法，唯以長藥為異。

Fifth, declaring pure. After performing the verbal procedure for a seven-day medicine, because one has a partial attachment to it as one's own, one must declare it pure in order to keep it: first, the substance of the medicine is valuable, so greed and hoarding are frequent; second, it lasts for a long time without undergoing change; third, its flavour and potency are exceptional, strengthening the body. It is ruled that it must be declared pure so as to abandon attachment! For seven-day medicine received only by hand, the duration is brief and faults are rare, so it also does not need to be declared pure. The other three medicines lack these conditions in reverse, and therefore do not need to be declared pure. The purification method is generally identical to that for robes, differing only regarding extra medicine.