For the source text click/tap here: Zevachim 92
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According to the Torah (see Sefer Vayikra 6:20-21), in the context of discussing a korban ḥatat – a sin offering – “Whatsoever shall touch the flesh thereof shall be holy; and when there is sprinkled of the blood upon any garment, thou shalt wash that whereon it was sprinkled in a holy place. But the earthen vessel wherein it is cooked shall be broken; and if it be cooked in a brazen vessel, it shall be scoured and rinsed in water.”
The first Mishna in our new Perek 7 teaches that this law is limited to blood that could be sprinkled on the altar. Thus, if the korban was disqualified for some reason, and the blood could not be sprinkled, or if it had been collected by someone who was unfit to participate in the sacrificial service (see above, daf 15) it also would not need to be cleaned from the priestly clothing.
Similarly, if the sprinkling of the blood had already been done by the kohanim, the remnants of the blood would no longer require washing.
Perhaps the most technically intricate section of the Talmudic discussion concerns the quantity of blood necessary to create a laundering obligation. The Mishnah had already indicated that the blood must be "fit for spattering," but what quantity of blood satisfies this condition? The Talmud introduces the concept of nitza (literally, "spattering" or "staining") as a technical threshold .