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1. If a person sees someone slaughter a Chayah or bird but fail to cover the blood, the onlooker should cover the blood.
2. The blood of a Chayah or bird must be covered by hand, not by foot.
3. One who covers the blood of a Chayah or bird before the Shochet has a chance to do so must pay him ten gold pieces.
4. If one covers the blood of a Chayah or bird and it subsequently becomes uncovered, he is exempt from covering it again.
5. If the blood of a Chayah or bird was covered by earth blown by the wind, one is not obligated to cover the blood unless it subsequently becomes uncovered.
6. If the blood of a Chayah or bird was absorbed in the ground, one is obligated to cover the blood if it is still discernible.
7. If the blood of a Chayah or bird became mixed with water and the mixture has the appearance of blood, one is obligated to cover it.
8. If the blood of a Chayah or bird became mixed with wine or with the blood of a Behemah, the mixture has the status of water. Rebbi Yehudah maintains that blood is never Mevatel other blood.
9. Rav Papa maintains that even if the blood of the Chayah falls into water one drop at a time, if the mixture has the appearance of blood it is not Batel because the concept of "Ein Dichuy" applies to Mitzvos.
10. If blood becomes mixed with rainwater by itself and the mixture has the appearance of blood, the mixture is Machshir.
11. Blood became mixed with water, and the mixture has the appearance of blood. If there is an olive's volume of blood in the mixture, one who eats the mixture is Chayav Kares. If there is a Revi'is of blood in the mixture, it is Metamei b'Ohel.
A BIT MORE
1. However, l'Chatchilah the person who performed the Shechitah should cover the blood himself.
2. It is a disgrace to the Mitzvah to cover the blood with a foot.
3. The ten gold pieces are the reward for the blessing, and thus the reward for Birkas ha'Mazon is forty gold pieces: ten gold pieces for each blessing.
4. Although one who returns a lost object must return it again if it becomes lost again (even a hundred times), the Shochet is not required to cover the blood of a Chayah or bird more than once, as derived from a Mi'ut in the Torah.
5. If it becomes uncovered he is obligated to cover it because of the principle of "Ein Dichuy": if a Mitzvah becomes temporarily inapplicable, when it becomes applicable again the obligation to perform does not remain "pushed off" and one is obligated to perform the Mitzvah.
6. Since the blood-stain is discernible, one is obligated to cover it even if it is not subsequently uncovered.
7. Since it has the appearance of blood, it is not Batel and must be covered.
8. We assess whether the blood of the Chayah or bird would be discernible if it would be mixed with the same volume of water instead of with wine or with blood. If it would be discernible, then one is obligated to cover it. According to Rebbi Yehudah, if it was mixed with other blood, one is obligated to cover it because blood is not Mevatel blood.
9. Although each drop of blood that falls in becomes Batel in the water, when enough drops of blood subsequently fall in that the water has the appearance of blood, the blood is not Batel because "Ein Dichuy," and the Mitzvah to cover the blood applies.
10. Rainwater is Machshir only with Machshavah. However, if enough blood becomes mixed with the rainwater such that the mixture has the appearance of blood, it is Machshir even without Machshavah because of the blood. If one picks up the utensil with the rainwater in order to mix blood with it, it is Machshir even if it does not have the appearance of blood, because picking up the utensil is regarded as Machshavah.
11. One is Chayav Kares for eating the blood if there is at least an olive's volume of blood besides the water. The mixture is Metamei b'Ohel if there is at least a Revi'is of blood besides the water.
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