Reference for Chullin 175:12
וכסהו מלמד שדם הניתז ושעל הסכין חייב לכסות אמר רבי יהודה
teaches that the blood which spurted out and that which is upon the knife must be covered up.
Jastrow
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וכסהו מלמד שדם הניתז ושעל הסכין חייב לכסות אמר רבי יהודה
teaches that the blood which spurted out and that which is upon the knife must be covered up.