- Sections
- Bemare Habazak - Rabbis Questions
- Family and Society
- The Laws of Kashrut
2050
Answer: We will divide our view of the sources and analysis to deal with this excellent question into three parts: 1. What causes timtum halev? 2. How severe is exposure to it? 3. How should concern about it affect our decisions?
What causes timtum halev ? The classical source that introduces the concept of timtum halev is the gemara (Yoma 39a). It derives from the spelling of "v’nitmeitem bam" (you will become defiled) in the context of eating sheratzim (crawling creatures) (Vayikra 11:43) that it causes not just tumah but also timtum of the heart. (We will not try to describe it exactly – Rashi (ad loc.) says "it seals off and blocks out all wisdom.") The gemara’s statement is that "sins causes timtum halev." There are at least three ways to understand this gemara (the approaches are not mutually exclusive but can be complementary):
A. Acts of sin cause timtum halev, irrespective of exposure to a problematic object. The Maharal (Tiferet Yisrael 8) and Rav Kook (Mussar Avicha 1:4) have this understanding, which is the simple reading of the gemara (see Beit Halevi, Bereishit 6:5).

Bemare Habazak - Rabbis Questions (594)
Rabbi Daniel Mann
205 - Why Not Use an Eiruv?
206 - Timtum Halev – Part I
207 - Timtum Halev – Part II
Load More
C. Forbidden foods are not necessarily naturally damaging to the spirit, but after the Torah forbade them, they become so.
There are practical differences between these approaches. The following prohibitions seem to lack a naturally damaging element. Therefore, A applies and B does not (C depends on the case). 1. Forbidden actions that do not include ingesting foods; 2. Foods that are forbidden based on Rabbinic law – Hashem apparently created these foods to not be timtum causing, but the Rabbis forbade them due to various halachic concerns; 3. Foods that are forbidden because they are too holy for the eater (e.g., teruma, certain korbanot); 4. Foods that are forbidden only at certain times (e.g., food on Yom Kippur, chametz on Pesach); 5. Foods that are forbidden for a circumstantial moral reason (e.g., mother and child shechted on the same day, ever min hachay – see Moreh HaNevuchim III:48).
In the other direction, in the following cases, a prohibited food has entered the body, without moral culpability, so that A does not apply and B and C do: 1. The person eating followed halachic rules, which resulted in ingesting the forbidden food (e.g., animal had blemishes we are not required to check for, bitul made it permitted); 2. The eater is not forbidden to eat the food (non-Jew, small child, severely mentally disabled); 3) One needed to eat it to save his life; 4) The substance entered the body in a way other than eating.
We begin a small sampling of the many sources that provide different views of some of these matters before focusing on the most central. Chashukei Chemed (Megilla 13a) cites a machloket whether eating forbidden food based on an unavoidable mistake creates negative spiritual effects (Rav Pe’alim – no; Ramah M’panu – yes; see Pitchei Teshuva, Yoreh Deah 29:1). Besides saying that without fault there is no cause for timtum, it is also possible that Hashem intervenes to rectify the spirit of one who followed halacha (see Derashot Haran 11, who says similarly regarding a case in which Sanhedrin mistakenly permits something that should be forbidden).
The Netziv (Devarim 6:11) says that the reason it is better toshecht an animal on Shabbat for a dangerously sick person than to give him non-kosher meat is that the latter causes timtum. This assumes that timtum exists even without wrongdoing. However, the fact that all the Rishonim give other explanations (see Beit Yosef, Orach Chayim 328) demonstrates the opposite.
We will continue with further analysis next week.

Ask the Rabbi: Switching Mantels Back on Shabbat
Rabbi Daniel Mann | Kislev 5785

Shehecheyanu, Clothes, and Renovations During Sefira
Rabbi Daniel Mann

Ask the Rabbi: “Cooked” and Sweetened Wine for Kiddush
Rabbi Daniel Mann | Tevet 5785

Lack of Unity in “Unified” Minyan
Various Rabbis | 5774

Rabbi Daniel Mann

Timtum Halev – Part II
Adar I 8 5776

Washing Hands with Soap on Yom Kippur
Tishrei 4 5776

Bikur Cholim by Electronic Means
Shvat 1 5782

Giving an Envelope on Shabbat to Use for Donations
5773

The Mitzvah of “Duchening” - Birchas Kohanim
Rabbi Yirmiyohu Kaganoff | 5769

Fasting on the Wedding Day
Rabbi Yirmiyohu Kaganoff | Sivan 9 5779
The Laws Relating to Converts
Rabbi Eliezer Melamed

May I take a Nice Hot Shower on Yom Tov?
Rabbi Yirmiyohu Kaganoff | 5769
Daf Yomi Makkot Daf 7
R' Eli Stefansky | 17 Nisan 5785
