[If] one immersed himself for unsanctified food and [only] intended [to cleanse himself] for unsanctified food, he is prohibited from [eating] maaser. [If] he immersed himself for maaser and [only] intended [to cleanse himself] for maaser, he is prohibited from [eating] terumah. [If] he immersed himself for terumah and [only] intended [to cleanse himself] for terumah, he is prohibited from [eating] kodesh. [If] he immersed himself for kodesh and [only] intended [to cleanse himself] for kodesh, he is prohibited [from touching] water of cleansing.  [If] he immersed himself for a more stringent matter, he is permitted [to occupy himself with] a less stringent matter.  [If] he immersed himself without any intention, [it is deemed] as if he had not immersed himself.

The garments of an am haaretz have midras [-contamination] for perushim. Garments of perushim have midras[-contamination] for those who eat terumah. Garments of those who eat terumah have midras[-contamination] for [those who eat] kodesh. Garments of [those who eat] kodesh have midras[-contamination] for [those who handle] purification water.  Yosef ben Yoezer was the most devout of the Kohanim; yet his napkin was [deemed to have] midras[-contamination] for [those who eat] kodesh.  Yochanan ben Gudgada used to eat according to the purity [regulations] of kodesh all his life; yet his napkin was [deemed to have] midras[-contamination] for [those who handle] purification water.