. [A quarter-log of corpse blood] was spilled in the air — if the place [where the blood spilled] was on an incline, and [a person] formed an ohel over part [of the blood], he remains tahor. [If the blood] was in a crack or if it congealed, [the person] becomes tamei. [If the blood] was spilled onto the threshold [of a house] that inclines either inward or outward, and the house forms a roof over it, [the house] remains tahor. [If the blood] was in a crack or [if] it congealed, [the house] becomes tamei. Every part of a corpse is tamei, except for the teeth, hair, and nails. But while they are connected [to the body], they are all tamei.