תּלמוד אויף יואל 2:20

MISHNAH: An onion which one added to lentils, if whole it is permitted, if cut up it depends on transferring taste¹Profane onion in cooked but cold heave lentils; if the heave changes the taste of the profane food everything has to be eaten by a Cohen under the rules of heave. Otherwise, the profane remains profane and permitted to everybody.. Any other cooked food, whether whole or cut up, depends on transferring taste. Rebbi Jehudah permits in anchovies²In translation and interpretation, one has the choice between biblical “stinking dish” (Joel 2:20) or mishnaic “small salted fish in brine” (Mishnah Nedarim 5:5), Arabic צחן. Maimonides chooses the first alternative, R. Simson the second. One has to wonder that the medical doctor Maimonides would think of saving spoiled food.
If an entire onion of heave is put into the brine to absorb impurities, the anchovies remain profane according to R. Jehudah. where it only serves to remove pollutants.
If a mashed apple¹³The heave apple’s influence makes the entire profane dough change nature; even if the amount of apple is negligible, its action is not and it cannot be disregarded. is added to dough and it soured, [the dough] is forbidden⁴In that case, the lentils have to be eaten by a Cohen in purity. In all these discussions, “forbidden” means forbidden to the layman and the impure.. But if barley grains fell into a cistern of water, even though they made it stink, [the water] is permitted¹⁴Since anything that destroys the taste does not make forbidden..

5) Isaiah called it the stumbling block, as it is said, “Build up, build up! Clear the way, Take up the stumbling-block out of the way of my people” (Isaiah 57:14). 6) Ezekiel called it a stone, as it is said, “And I will take away the heart of stone out of your flesh and I will give you a heart of flesh” (Ezekiel 36:26). 7) Joel called it the Hidden One, as it is said, “But I will remove far off from you the hidden one” (Joel 2:20). Our Rabbis taught: “But I will distance from you the northern one (tz’foni)” (Joel 2:20): This refers to the Evil Inclination which is constantly hidden (tzafun) in the heart of man;

“And will drive him into a land barren and desolate” to a place where there are no men for him to attack; “With his face toward the eastern sea (hadkomoni)”: that he set his eyes against the First Temple and destroyed it and slew the scholars who were in it; “And his back part toward the western sea”: that he set his eyes against the Second Temple and destroyed it and slew the scholars who were in it. “And the stench of it shall go up and the foul smell rise”: that he leaves the other nations in peace and attacks only Israel. “Because he has done great things”: Abaye explained: Against scholars more than against anyone else;