Peeled Egg Left Out Overnight

Greetings,

It is forbidden to use peeled garlic, onions, and eggs that have been left out overnight, even if they were covered or placed in the refrigerator.

To prevent them from becoming forbidden, the advice is to leave some of the skin or root on them or to mix them into other foods (before dawn) such as salads and the like. Therefore, if you mixed the egg with food or drink before dawn, it is permitted to eat.

Sources: This is stated in the tractate Niddah (17a) in the name of Rabbi Shimon bar Yochai that one who eats peeled garlic, peeled onions, and peeled eggs that have been left out overnight is liable for his life and bears his own blood. Even if they are wrapped and tied, an evil spirit rests upon them. This is brought to Halacha in the Shulchan Aruch HaRav (Laws of Body and Soul, paragraph 7). It is also mentioned in the book Shmirat HaGuf VeHaNefesh part 1 (section 3) and in Responsa Berachot Yehudah part 2 (Yoreh Deah section 7, letter 8) regarding refrigeration. See also Responsa Yaviat Omer part 10 (Yoreh Deah section 9) and in Shmirat HaGuf VeHaNefesh part 2 (page 9).

The advice to leave some of the skin or root is sourced from Niddah there, and has been brought to Halacha in Shulchan Aruch HaRav.
The advice to mix them into other foods is sourced from the Sefer Mitzvot Katan (section 191). This is also mentioned in the book Ben Ish Chai (second year, Parashat Pinchas, letter 14) and in Kaf HaChaim part Yoreh Deah (section 216, letter 152) and in Responsa Yaviat Omer part 2 (Yoreh Deah section 7, letter 9) and in Responsa Aben Yisrael part 9 (section 126, letter 3). It is also brought in the name of the Chazon Ish, zt'l, in Shmirat HaGuf VeHaNefesh part 1 (on page 25). Moreover, see the book Shulchan Yosef (page 87, paragraph 33) that cites Rabbi Ovadia Yosef, zt'l, that if onions were mixed into a salad and left overnight, they are permissible to eat.

Best regards,

Hillel Meirs