Rabbi Tzvi Hirsch Haber

Rabbi, Los Angeles, CA

Fingernail Fun Facts

by | Jun 5, 2009 | 14 comments

We Orthodox Jews tend to get the heebee jeebies when it comes to nails (the ones that grow on fingers and toes, not the ones that are intentionally hit with a hammer).

What is the background of this? A brief history:

The Gemara (Moed Katan 18a, Niddah 17a) says that there are three types of nail cutters – righteous, pious and evil. The righteous bury their nails, the pious burn them and the evil people just throw them down.  The Gemara goes on to explain that the problem with the nails being in a public place is that a pregnant woman may step on them.

So what’s the big deal if a pregnant woman steps on nails? The Ran offers two explanations; her revulsion upon seeing them may cause her to miscarry, and “keshafim”, or evil spirits, are associated with nails. (We’ll get back to that).

The Pri Megadim (OC 260) offers the following:

Adam HaRishon was created covered by nail like material over his skin. After the sin it was removed, remaining only on his fingers and toes. Since Woman is generally blamed for the original sin, there is therefore a danger for pregnant women to step on finger and toe nails.

The Gemara (Ibid) qualifies this law by saying that if the nails are moved there is no danger. Therefore in a Beis Medrash or other place where women are not common one doesn’t have to worry, even if they will be swept up and placed outside. The Elya Raba writes that perhaps they have to be moved to an entirely different room.

Based on the above it would be prudent for a pregnant woman to avoid a nail salon.

Rav Steinman writes that he asked the Chazon Ish how come we don’t see women miscarrying due to a lack of diligence and knowledge of these laws? The Chazon Ish replied that as we are living in a time of Hester Panim there is ‘static’ between us and the spiritual powers associated with these dangers and there is therefore less of a risk.

Some other rules of (thumb)nails:

  • Not to cut on Thursday because they will sprout (presumably this means noticeably) on Shabbos.
  • Not to cut finger and toe nails on the same day (Mogen Avrohom 260). (Shulchon Hatahor recommends averting this problem by leaving one toenail uncut).
  • Only cut fingernails Erev Shabbos and Yom Tov (Ibid).
  • Based on the above the Mogen Avrohom recommends cutting toenails on Thursday and fingernails on Friday.
  • Not to cut nails on Rosh Chodesh (R’ Yehuda Hachassid quoted in Ba’er Haitiv OC 260).
  • The Rema says not to cut fingernails in order. The order he gives is 42531 for the left hand and 24135 for the right. The Arizal laughed at this practice and the Maharam Miruttenberg was not particular about this. The Mogen Avrohom recommends being stringent. There are various opinions as to which hand to cut first, the Rema seems to favor the left. (See Pri Megadim and Ashel Avrohom Mibutshetsh).All this does not apply to toenails. (Chazon Ish).


The Aruch Hashulchan (OC 260:6) writes that all of the above are not halachic obligations rather one who is careful should be, and one who is not doesn’t have to start.


There is a definite preference for one to cut their fingernails on Friday in honor of Shabbos. It is a matter of dispute as to when is the correct time to do this, some say specifically in the morning, others choose the afternoon. Some say before the Mikvah, others say after.

Netilas Yadayim and Tevilah

Dirt on hands is considered a chatzitzah, or separation, for ritual hand washing and would have to be removed before washing for bread. The same applies for dirt under nails, but only on the portion of the nail that extends beyond the finger. For immersion in a Mikvah we are more stringent and require that the nail be completely clean, therefore we cut them for tevilah.


As mentioned, there are evil spirits associated with nails. Although I have absolutely no understanding of this, it seems that the part of the nail that extends beyond the finger contains little bad guys and the part that is near the skin contains the really good guys.


The Rema (OC 298:3) quotes the Zohar that when one makes the blessing on the candles during Havdalah on Motzai Shabbos one should look at the nails of their right hand with the hand curled inward and the thumb tucked away out of sight.

The Mishna Berura explains that one has to have enough benefit from the light to differentiate between different coins. We ascertain this by differentiating between the nail and the finger which are of similar color. He adds that nails are considered a sign of blessing because they are constantly growing. I’m not sure why we avoid the thumb, if anyone knows please let me know.

Chol Hamoed

It is forbidden to cut nails on Chol Hamoed under ordinary circumstances unless they were cut on Erev Yom Tov or for a mitzvah (e.g. Mikvah).

By Rabbi Tzvi Hirsch Haber

Rabbi Tzvi Hirsch Haber is sought after by all who know him for his Halachic and practical advice. His keen ability to put complicated matters into a digestible perspective coupled with his ability to get the facts, make him the perfect blogger to help us all “Do It Right”.


  1. Sender

    The Arizal was known to cut his fingernails and toenails on Erev Shabbos. Reb Chaim Vital reports on this and his son writes that it was based on Sod. (Sefer Hakavanos, quoted in Machazik Bracha)

  2. Rayzel

    Thanks. Very interesting.

  3. David

    So I can tell my wife she’s not allowed get a manicure and pedicure for 9 months? That can save thousands$$$$$ – unfortunately she calls before and has them sweep first.

  4. shlomo

    Rabbi Haber
    i didnt notice anything about washing your hands afterwards and if what sbout if you bte them is there an order and iif bchlal itis mutar

  5. felix

    according to the ran that explains that women will be repulsed by nails on the floor what is the difference if the location has been moved

  6. TH

    Shlomo – I guess we have to do a part 2!
    Felix – good question, that is according to the other shitos that there is a sakana.
    BB – correct

  7. BB

    “The order he gives is 42531 for the left hand and 24135 for the right.”

    Wherein #1 of each hand is its thumb?

  8. Aharon

    Does anybody really believe any of this nonsense? Little demons living in my toe nails? Miscarriages upon seeing nail clippings? Gevalt, people, toss the midieval superstitions and get real.

  9. David

    If you believe it its true. I have seen for myself a miscarriage b/c of it – the frum cleaning lady in yeshiva had one and it happens that the bochurim in the dira were not at all careful to dispose of the nail clippings properly. needless to say after the incident it was done K’halacha……

  10. Aharon

    Well, that proves that some people will believe anything.
    Calling P.T. Barnum…

  11. Sean

    Does it mean when she steps on it barefoot or even wearing shoes?

  12. TH

    the accepted understanding is even when wearing shoes.

  13. Freddy

    I heard that we do not look at the thumb because before the cheit with the eitz hada’as, Adam did not need to work for his bread, and therefore opposable thumbs were not necessary for humans. Only after the cheit, did we need to do work. Therefore, the thumbs serve as a reminder of the cheit, so we hide them when we look at our fingers at havdala.


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