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8

As always, the answer is: "it's a machlokes!" Open up a Shulchan Aruch to Yoreh Deah 116:2, where it says not to mix meat and fish. The Taz's opinion is that because meat-and-fish is a health concern, we are stricter about it than normal kashrus prohibitions, therefore if you pour one ounce of fish juice into a hundred ounces of beef broth, you may not eat ...


4

This is discussed by the poskim to Shulchan Aruch YD 99:6. The Ram'a there rules that if some milk got mixed with more than 60 times as much water, and then this water/milk mixture later was mixed with meat, the final mixture would be permitted although there is not 60 times as much meat as milk. This is because the milk already became nullified in the ...


4

Shulchan Aruch O.C. 448:5 rules that chometz which is found in your home after Pesach, even if you nullified it, is forbidden. The Tur there (cited by Magen Avraham and Taz) explains that we are worried that a person will say he nullified it even if he didn't. This isn't a problem for those crumbs that you don't want anyways. But for that box of cheerios ...


3

Shulchan Aruch HaRav (OC 431:4) writes that the Chachamim don't allow you to retain Chametz on your property during Pesach for two reasons: 1) You may not mean it when you say it is hefker and 2) you may forget and go eat it. So if you are going to keep Chametz in your closet over Pesach, hefker won't be enough, it has to be sold. Selling Chametz is a much ...


3

The seffer Maadanei HaShulchan in סימן פ׳ט s.v. 33 & 34 says that the תבשיל של בשר and תבשיל של גבינה which are subject to the minhag to be treated as real meat and milk as far as waiting goes, are specifically referring to תבשיל which do not have ששים and therefore do have טעם of whichever מין Is under discussion. At a surface glance he does not seem ...


2

Rambam Metammei Mishkav uMoshav 2:6 says that if a Zav's saliva fell into water and it dissolved into the water then everything is Tahor assuming the water hasn't changed color. Looking at further cases there (eg. urine of a Zav mixed with urine of a Tahor person) it seems that in general we go by majority assuming the item in question isn't still detectable ...


1

According to the explicit specifications of the halakhah, the only amount which is required by law to be removed is that of a kezayith. Or, if there are several pieces of hamess that, when gathered together, would equal the amount of a kezayith or more - in the same room - then it is required to remove them. (cf. Rambam, Mishneh Thorah, Hilkhoth Hamess ...


1

The formulation for bitul chametz is is כל חמירא וחמיעא דאיכא ברשותי, דחזיתיה ודלא חזיתיה, דבערתיה ודלא בערתיה, לבטיל ולהוי הפקר כעפרא דארעא" Significant amounts of chametz cannot be nullified since it wouldn't realistically be possible to see it as "dust."


1

The original practice of Bittul (Pesachim 6b) was for after one searched for and found all Chametz, and essentially we are left a concern that maybe he will find something small on Pesach that he missed, essentially saying "that too is as irrelevant as dust." It does not help for a locked away closet full of Chametz. That being said, as a Torah matter, it ...



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