ציטירנדיקער פּירוש אויף דברים 14:21

Fleisch jederlei Art darf nicht in Milch gekocht werden. Das Verbot לא תבשל גדי בחלב אמו „du sollst das Böcklein nicht in der Milch seiner Mutter kochen“ wird in der Schrift dreimal wiederholt (Exod. 23, 19; 34, 26; Deut. 14, 21). Nach der mündlichen Überlieferung ist damit ein dreifaches Verbot ausgesprochen, Fleisch mit Milch zusammen zu kochen, das zusammen Gekochte zu geniessen, und auch es in irgend einer anderen Weise zu verwenden. Nach der recipierten Halacha bezieht sich dieses Verbot jedoch nur auf Fleisch von einem Vieh, nicht auf Fleisch von Wild und Geflügel. Nach rabbinischer Verordnung darf auch Fleisch von Wild und Geflügel, das mit Milch zusammen gekocht worden ist, nicht gegessen werden, das Zusammenkochen dagegen ist auch nach rabbinischer Verordnung nicht verboten, ebenso nicht, das zusammen Gekochte in anderer Weise zu verwenden. Der Ausspruch der Mischna ist demnach dahin zu verstehen, dass das Verbot von בשול בשר בחלב, insofern das so zusammen Gekochte für den Genuss verboten ist, sich auf Fleisch jederlei Art bezieht, auch auf das von Wild und Geflügel.

An unclean person who ate holy meat (Leviticus 7:20, 12:4);
One who entered the sanctuary while unclean (Leviticus 12:4, Numbers 5:3, 19:13);
One who ate forbidden fat or blood (Leviticus 3:16, 7:23-27);
Or leftover sacrificial meats (Leviticus 19:6-8);
Or sacrifices that had been offered up with improper intention (Leviticus 7:18);
Or [an offering] that has became unclean (Leviticus 7:19);
One who slaughters, or offers up a sacrifice, outside the Temple precincts (Leviticus 17:4);
One who ate leavened [bread] during Passover (Exodus 12:15, 19);
One who partakes of food [or drink] or does work on the Day of Atonement (Leviticus 23:27-31);
One who puts together the ingredients for the [anointing] oil, or the ingredients for the incense, or anoints with the oil for anointing (Exodus 30:22-28):
One who eats an animal that died a natural death (Deuteronomy 14:21);
Or was improperly slaughtered (Exodus 22:30);
Or any of the [creatures deemed] ‘abominable’ and ‘teeming’ (Leviticus 11:11, 40).
One who eats non-tithed produce, or first-tithe from which heave offering has not been removed, or unredeemed second-tithe, or unredeemed sanctified property.
How much untithed produce is one to eat to become liable? Rabbi Shimon says: “Any amount.” The Sages say: “An olive's size.” Rabbi Shimon said to them: “Do you not admit that if one ate the minutest ant that he would be liable? They said to him: “[Only] because it is a whole creature.” He said to them: “Even a grain of wheat is a whole entity.”
The first fourteen sections of our mishnah mostly lists different types of forbidden foods and a few other Temple related prohibitions for which one is to be flogged. Section fifteen discusses the amount of untithed produce that if one eats he is liable for a transgression.
Section fifteen: According to Rabbi Shimon one is liable for flogging if he eats any amount of untithed produce, even a single grain. The Sages disagree and state that only if one eats an olive’s size of untithed produce is he liable for flogging. Less than that and he is exempt. Rabbi Shimon attempts to prove his point by making an analogy to eating an entire ant. All agree that if one eats an entire ant (on purpose) he is liable to be flogged, even though the ant is smaller than an olive. The Sages respond that one is liable for eating an ant since it is an entire creature. Since it is a distinct, full entity it is enough to make one who consumes it liable for punishment. Rabbi Shimon responds that a single grain is also a whole entity, and therefore one who eats a single grain of untithed produce is liable to be flogged as well.

Beim רמאי findet kein חומש statt. Bei dem zweiten Zehnt, den man vom Demai absondert, braucht nicht wie sonst bei der Auslösung ein Fünftel hinzugefügt zu werden. Das מעשר שני hat seine Begründung auch in Deuter. 14,21, wo es heisst עשר תעשר.

כל תועבה [THOU SHALT NOT EAT] ANY ABOMINATION — i.e. anything that I have declared to be an abomination to you (which in itself may not be an abominable thing) — as for instance if one deliberately makes a slit in the ear of a firstborn animal (thus making it unfit for sacrifice) so that one may slaughter it in the country (i.e. outside Jerusalem) and eat it there. Here you have a thing I declared to be an abomination to you, in that I commanded you (Leviticus 22:21) “one shall cause no blemish to be therein”. Scripture now comes and teaches you here that one should not slaughter such an animal and eat it, on account of that blemish. Another example: If one boils meat in milk — here you have a thing that I have declared to be an abomination to you (cf. Exodus 23:19; Exodus 34:26; Deuteronomy 14:21), and here it lays down the prohibition about eating it (Chullin 114b).