Per Yoreh Deah 241:3 one should not take out a thorn embedded in his father as it may cause a wound. One should also not do a phlebotomy on his father. I have heard people saying that this would extend to haircuts also as at times it may lead to slight bleeding. Is there a source for this one way or the other?
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readings - Appending 内 to a company name is read ない or うち?
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